/*.dt-button-collection a.buttons-columnVisibility:before,
.dt-button-collection a.buttons-columnVisibility.active span:before {
    display:block;
    position:absolute;
    top:1.2em;
    left:0;
    width:12px;
    height:12px;
    box-sizing:border-box;
}

.dt-button-collection a.buttons-columnVisibility:before {
    content:' ';
    margin-top:-6px;
    margin-left:10px;
    border:1px solid black;
    border-radius:3px;
}

.dt-button-collection a.buttons-columnVisibility.active span:before {
    content:'\2714';
    margin-top:-11px;
    margin-left:12px;
    text-align:center;
    text-shadow:1px 1px #DDD, -1px -1px #DDD, 1px -1px #DDD, -1px 1px #DDD;
}

.dt-button-collection a.buttons-columnVisibility span {
    margin-left:20px;
}
*/
.dt-button-collection .dt-button.buttons-columnVisibility {
    background: none !important;
    background-color: transparent !important;
    box-shadow: none !important;
    border: none !important;
    padding: 0.25em 1em !important;
    margin: 0 !important;
    text-align: left !important;
}
.dt-button-collection .buttons-columnVisibility:before,
.dt-button-collection .buttons-columnVisibility.active span:before {
    display:block;
    position:absolute;
    top:1.2em;
    left:0;
    width:12px;
    height:12px;
    box-sizing:border-box;
}
.dt-button-collection .buttons-columnVisibility:before {
    content:' ';
    margin-top:-8px;
    margin-left:10px;
    border:1px solid black;
    border-radius:3px;
}
.dt-button-collection .buttons-columnVisibility.active span:before {
    font-family: 'Arial' !important;
    content:'\2714';
    margin-top: -15px;
    margin-left: 12px;
    text-align: center;
    text-shadow: 1px 1px #fff, -1px -1px #fff, 1px -1px #fff, -1px 1px #fff;
}
.dt-button-collection .buttons-columnVisibility span {
    margin-left:17px;
}