figureslibres.cc/user/themes/figureslibres/scss/theme/_sidebar.scss

.sidebar-right{
  position: fixed;
  width: 20%;
  height: 100%;
  top: 0;
  right: 0;
  display: flex;
  ul{
    margin: auto;
    text-align: right;
    margin-right: 20px;
    a{
      color: grey;
      position: relative;
      &:hover{
        li{
          position: relative;
          &::after{
            content: " ";
            top: 7px;
            right: -13px;
            display: block;
            position: absolute;
            background-color: grey;
            border-radius: 5px;
            width: 7px;
            height: 7px;
          }
        }
      }
    }
  }
}