first import

sites/all/modules/openlayers/themes/default_dark/img/README.txt

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+Default image set for the OpenLayers Drupal module.
+
+Many original images used with permission (and licensed under GPL)
+from MapBox.
+
+https://github.com/developmentseed/openlayers_themes

sites/all/modules/openlayers/themes/default_dark/openlayers_style.css

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+div.olMap {
+    z-index: 0;
+    padding: 0 !important;
+    margin: 0 !important;
+    cursor: default;
+}
+
+div.olMapViewport {
+    text-align: left;
+}
+
+div.olLayerDiv {
+   -moz-user-select: none;
+   -khtml-user-select: none;
+}
+
+.olLayerGoogleCopyright {
+    left: 2px;
+    bottom: 2px;
+}
+.olLayerGoogleV3.olLayerGoogleCopyright {
+    right: auto !important;
+}
+.olLayerGooglePoweredBy {
+    left: 2px;
+    bottom: 15px;
+}
+.olLayerGoogleV3.olLayerGooglePoweredBy {
+    bottom: 15px !important;
+}
+.olControlAttribution {
+    font-size: smaller;
+    right: 3px;
+    bottom: 4.5em;
+    position: absolute;
+    display: block;
+}
+.olControlScale {
+    right: 3px;
+    bottom: 3em;
+    display: block;
+    position: absolute;
+    font-size: smaller;
+}
+.olControlScaleLine {
+   display: block;
+   position: absolute;
+   left: 10px;
+   bottom: 15px;
+   font-size: xx-small;
+}
+.olControlScaleLineBottom {
+   border: solid 2px black;
+   border-bottom: none;
+   margin-top:-2px;
+   text-align: center;
+}
+.olControlScaleLineTop {
+   border: solid 2px black;
+   border-top: none;
+   text-align: center;
+}
+
+.olControlPermalink {
+    right: 3px;
+    bottom: 1.5em;
+    display: block;
+    position: absolute;
+    font-size: smaller;
+}
+
+div.olControlMousePosition {
+    bottom: 0;
+    right: 3px;
+    display: block;
+    position: absolute;
+    font-family: Arial;
+    font-size: smaller;
+}
+
+.olControlOverviewMapContainer {
+    position: absolute;
+    bottom: 0;
+    right: 0;
+}
+
+.olControlOverviewMapElement {
+    padding: 10px 18px 10px 10px;
+    background-color: #00008B;
+    -moz-border-radius: 1em 0 0 0;
+}
+
+.olControlOverviewMapMinimizeButton,
+.olControlOverviewMapMaximizeButton {
+    height: 18px;
+    width: 18px;
+    right: 0;
+    bottom: 80px;
+    cursor: pointer;
+}
+
+.olControlOverviewMapExtentRectangle {
+    overflow: hidden;
+    background-image: url("img/blank.gif");
+    cursor: move;
+    border: 2px dotted red;
+}
+.olControlOverviewMapRectReplacement {
+    overflow: hidden;
+    cursor: move;
+    background-image: url("img/overview_replacement.gif");
+    background-repeat: no-repeat;
+    background-position: center;
+}
+
+.olLayerGeoRSSDescription {
+    float:left;
+    width:100%;
+    overflow:auto;
+    font-size:1.0em;
+}
+.olLayerGeoRSSClose {
+    float:right;
+    color:gray;
+    font-size:1.2em;
+    margin-right:6px;
+    font-family:sans-serif;
+}
+.olLayerGeoRSSTitle {
+    float:left;font-size:1.2em;
+}
+
+.olPopupContent {
+    padding:5px;
+    overflow: auto;
+}
+
+.olControlNavigationHistory {
+   background-image: url("img/navigation_history.png");
+   background-repeat: no-repeat;
+   width:  24px;
+   height: 24px;
+
+}
+.olControlNavigationHistoryPreviousItemActive {
+  background-position: 0 0;
+}
+.olControlNavigationHistoryPreviousItemInactive {
+   background-position: 0 -24px;
+}
+.olControlNavigationHistoryNextItemActive {
+   background-position: -24px 0;
+}
+.olControlNavigationHistoryNextItemInactive {
+   background-position: -24px -24px;
+}
+
+div.olControlSaveFeaturesItemActive {
+    background-image: url(img/save_features_on.png);
+    background-repeat: no-repeat;
+    background-position: 0 1px;
+}
+div.olControlSaveFeaturesItemInactive {
+    background-image: url(img/save_features_off.png);
+    background-repeat: no-repeat;
+    background-position: 0 1px;
+}
+
+.olHandlerBoxZoomBox {
+    border: 2px solid red;
+    position: absolute;
+    background-color: white;
+    opacity: 0.50;
+    font-size: 1px;
+    filter: alpha(opacity=50);
+}
+.olHandlerBoxSelectFeature {
+    border: 2px solid blue;
+    position: absolute;
+    background-color: white;
+    opacity: 0.50;
+    font-size: 1px;
+    filter: alpha(opacity=50);
+}
+
+.olControlPanPanel {
+    top: 10px;
+    left: 5px;
+}
+
+.olControlPanPanel div {
+    background-image: url(img/pan-panel.png);
+    height: 18px;
+    width: 18px;
+    cursor: pointer;
+    position: absolute;
+}
+
+.olControlPanPanel .olControlPanNorthItemInactive {
+    top: 0;
+    left: 9px;
+    background-position: 0 0;
+}
+.olControlPanPanel .olControlPanSouthItemInactive {
+    top: 36px;
+    left: 9px;
+    background-position: 18px 0;
+}
+.olControlPanPanel .olControlPanWestItemInactive {
+    position: absolute;
+    top: 18px;
+    left: 0;
+    background-position: 0 18px;
+}
+.olControlPanPanel .olControlPanEastItemInactive {
+    top: 18px;
+    left: 18px;
+    background-position: 18px 18px;
+}
+
+.olControlZoomPanel {
+    top: 71px;
+    left: 14px;
+}
+
+.olControlZoomPanel div {
+    background-image: url(img/zoom-panel.png);
+    position: absolute;
+    height: 18px;
+    width: 18px;
+    cursor: pointer;
+}
+
+.olControlZoomPanel .olControlZoomInItemInactive {
+    top: 0;
+    left: 0;
+    background-position: 0 0;
+}
+
+.olControlZoomPanel .olControlZoomToMaxExtentItemInactive {
+    top: 18px;
+    left: 0;
+    background-position: 0 -18px;
+}
+
+.olControlZoomPanel .olControlZoomOutItemInactive {
+    top: 36px;
+    left: 0;
+    background-position: 0 18px;
+}
+
+/*
+ * When a potential text is bigger than the image it move the image
+ * with some headers (closes #3154)
+ */
+.olControlPanZoomBar div {
+    font-size: 1px;
+}
+
+.olPopupCloseBox {
+  background: url("img/close.gif") no-repeat;
+  cursor: pointer;
+}
+
+.olFramedCloudPopupContent {
+    padding: 5px;
+    overflow: auto;
+}
+
+.olControlNoSelect {
+ -moz-user-select: none;
+ -khtml-user-select: none;
+}
+
+.olImageLoadError {
+    background-color: pink;
+    opacity: 0.5;
+    filter: alpha(opacity=50); /* IE */
+}
+
+/**
+ * Cursor styles
+ */
+
+.olCursorWait {
+    cursor: wait;
+}
+.olDragDown {
+    cursor: move;
+}
+.olDrawBox {
+    cursor: crosshair;
+}
+.olControlDragFeatureOver {
+    cursor: move;
+}
+.olControlDragFeatureActive.olControlDragFeatureOver.olDragDown {
+    cursor: -moz-grabbing;
+}
+
+/**
+ * Layer switcher
+ */
+.olControlLayerSwitcher {
+    position: absolute;
+    top: 25px;
+    right: 0;
+    width: 20em;
+    font-family: sans-serif;
+    font-weight: bold;
+    margin-top: 3px;
+    margin-left: 3px;
+    margin-bottom: 3px;
+    font-size: smaller;
+    color: white;
+    background-color: transparent;
+}
+
+.olControlLayerSwitcher .layersDiv {
+    padding-top: 5px;
+    padding-left: 10px;
+    padding-bottom: 5px;
+    padding-right: 10px;
+    background-color: darkblue;
+}
+
+.olControlLayerSwitcher .layersDiv .baseLbl,
+.olControlLayerSwitcher .layersDiv .dataLbl {
+    margin-top: 3px;
+    margin-left: 3px;
+    margin-bottom: 3px;
+}
+
+.olControlLayerSwitcher .layersDiv .baseLayersDiv,
+.olControlLayerSwitcher .layersDiv .dataLayersDiv {
+    padding-left: 10px;
+}
+
+.olControlLayerSwitcher .maximizeDiv,
+.olControlLayerSwitcher .minimizeDiv {
+    width: 18px;
+    height: 18px;
+    top: 5px;
+    right: 0;
+    cursor: pointer;
+}
+
+.olBingAttribution {
+    color: #DDD;
+}
+.olBingAttribution.road {
+    color: #333;
+}
+
+.olGoogleAttribution.hybrid, .olGoogleAttribution.satellite {
+    color: #EEE;
+}
+.olGoogleAttribution {
+    color: #333;
+}
+span.olGoogleAttribution a {
+    color: #77C;
+}
+span.olGoogleAttribution.hybrid a, span.olGoogleAttribution.satellite a {
+    color: #EEE;
+}
+
+/**
+ * Editing and navigation icons.
+ * (using the editing_tool_bar.png sprint image)
+ */
+.olControlNavToolbar ,
+.olControlEditingToolbar {
+    margin: 5px 5px 0 0;
+}
+.olControlNavToolbar div,
+.olControlEditingToolbar div {
+    background-image: url("img/editing_tool_bar.png");
+    background-repeat: no-repeat;
+    margin: 0 0 5px 5px;
+    width: 24px;
+    height: 22px;
+    cursor: pointer
+}
+/* positions */
+.olControlEditingToolbar {
+    right: 26px;
+    top: 0;
+}
+.olControlNavToolbar {
+    top: 295px;
+    left: 9px;
+}
+/* layouts */
+.olControlEditingToolbar div {
+    float: right;
+}
+/* individual controls */
+.olControlNavToolbar .olControlNavigationItemInactive,
+.olControlEditingToolbar .olControlNavigationItemInactive {
+    background-position: -103px -1px;
+}
+.olControlNavToolbar .olControlNavigationItemActive ,
+.olControlEditingToolbar .olControlNavigationItemActive  {
+    background-position: -103px -24px;
+}
+.olControlNavToolbar .olControlZoomBoxItemInactive {
+    background-position: -128px -1px;
+}
+.olControlNavToolbar .olControlZoomBoxItemActive  {
+    background-position: -128px -24px;
+}
+.olControlEditingToolbar .olControlDrawFeaturePointItemInactive {
+    background-position: -77px -1px;
+}
+.olControlEditingToolbar .olControlDrawFeaturePointItemActive {
+    background-position: -77px -24px;
+}
+.olControlEditingToolbar .olControlDrawFeaturePathItemInactive {
+    background-position: -51px -1px;
+}
+.olControlEditingToolbar .olControlDrawFeaturePathItemActive {
+    background-position: -51px -24px;
+}
+.olControlEditingToolbar .olControlDrawFeaturePolygonItemInactive{
+    background-position: -26px -1px;
+}
+.olControlEditingToolbar .olControlDrawFeaturePolygonItemActive {
+    background-position: -26px -24px;
+}
+
+div.olControlZoom {
+    position: absolute;
+    top: 8px;
+    left: 8px;
+    background: rgba(255,255,255,0.4);
+    border-radius: 4px;
+    padding: 2px;
+}
+div.olControlZoom a {
+    display: block;
+    margin: 1px;
+    padding: 0;
+    color: white;
+    font-size: 18px;
+    font-family: 'Lucida Grande', Verdana, Geneva, Lucida, Arial, Helvetica, sans-serif;
+    font-weight: bold;
+    text-decoration: none;
+    text-align: center;
+    height: 22px;
+    width:22px;
+    line-height: 19px;
+    background: #130085; /* fallback for IE - IE6 requires background shorthand*/
+    background: rgba(0, 60, 136, 0.5);
+    filter: alpha(opacity=80);
+}
+div.olControlZoom a:hover {
+    background: #130085; /* fallback for IE */
+    background: rgba(0, 60, 136, 0.7);
+    filter: alpha(opacity=100);
+}
+@media only screen and (max-width: 600px) {
+    div.olControlZoom a:hover {
+        background: rgba(0, 60, 136, 0.5);
+    }
+}
+a.olControlZoomIn {
+    border-radius: 4px 4px 0 0;
+}
+a.olControlZoomOut {
+    border-radius: 0 0 4px 4px;
+}
+
+
+/**
+ * Animations
+ */
+
+.olLayerGrid .olTileImage {
+    -webkit-transition: opacity 0.2s linear;
+    -moz-transition: opacity 0.2s linear;
+    -o-transition: opacity 0.2s linear;
+    transition: opacity 0.2s linear;
+}

sites/all/modules/openlayers/themes/default_dark/style.css

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+/**
+ * @file
+ * CSS file for OpenLayers dark theme.
+ *
+ * We include the default styles, then add
+ * some specificity to override certain elements
+ * like image references.
+ */
+
+@import url(openlayers_style.css);
+
+
+.olControlOverviewMapExtentRectangle {
+  border: none;
+}
+.olControlOverviewMapRectReplacement {
+    background-image: url(img/overview_replacement.png);
+}
+
+/**
+ * A few custom styles
+ */
+.openlayers-popup {
+  color: #EEEEEE;
+}
+.olImageLoadError,
+.openlayers-map .olImageLoadError {
+  background-color: transparent;
+}
+
+/**
+ * CSS fix, see #1646646
+ */
+label.olButton {
+  display: inline;
+  margin-left: .5em;
+}
+
+/**
+ * Improve placement of controls that overlap when both are enabled.
+ */
+.openlayers_behavior_fullscreen_button_panelActive .olControlEditingToolbar {
+  right: 30px;
+}
+.olControlMousePositionActive .olControlAttribution {
+  bottom: 1.2em;
+  right: 3px;
+}
+
+/**
+ * Make the fullscreen behavior button match dark design.
+ * The fullscreen button is added to the editing tool bar PNG to reduce
+ * HTTP requests.
+ */
+.openlayers_behavior_fullscreen_buttonItemInactive {
+  background-image: url(img/editing_tool_bar.png);
+  background-position: -153px -1px;
+  width: 24px;
+  height: 22px;
+}
+.openlayers_map_fullscreen .openlayers_behavior_fullscreen_buttonItemInactive {
+  background-position: -153px -24px;
+}
+
+.openlayers-container {
+    position: relative;
+}
+
+/**
+ * The following are images that are not in
+ * this theme (but should be).
+ */
+
+/*
+.openlayers-map .olControlNavigationHistory {
+    background-image: url("img/navigation_history.png");
+}
+*/
+
+.openlayers-map .olControlOverviewMapRectReplacement {
+  background-image: url("img/overview_replacement.gif");
+}
+.openlayers-map .olControlNavigationHistory {
+  background-image: url("img/navigation_history.png");
+}
+.openlayers-map div.olControlSaveFeaturesItemActive {
+  background-image: url("img/save_features_on.png");
+}
+div.olControlSaveFeaturesItemInactive {
+  background-image: url("img/save_features_off.png");
+}
+.openlayers-map .olControlPanPanel div {
+  background-image: url("img/pan-panel.png");
+}
+.openlayers-map .olPopupCloseBox {
+  background: url("img/close.gif") no-repeat scroll 0 0 transparent;
+}
+.openlayers-map .olControlZoomPanel div {
+  background-image: url("img/zoom-panel.png");
+}