#button-to-top {
    display: inline-block;
    background-color: #FF9800;
    width: 50px;
    height: 50px;
    text-align: center;
    border-radius: 4px;
    margin: 30px;
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
    transition: background-color .3s, opacity .5s, visibility .5s;
    opacity: 0;
    visibility: hidden;
    color: #FFFFFF;
    font-weight: normal;
    font-style: normal;
    font-size: 2em;
    line-height: 50px;
}
#button-to-top:hover {
    cursor: pointer;
    background-color: #333;
}
#button-to-top:active {
    background-color: #555;
}
/*#button-to-top::after {
    content: "\f077";
    font-family: FontAwesome;
    font-weight: normal;
    font-style: normal;
    font-size: 2em;
    line-height: 50px;
    color: #fff;
}*/

#button-to-top.show {
    opacity: 1;
    visibility: visible;
}

.split, .gutter.gutter-horizontal {
    float: left;
}
.gutter.gutter-horizontal {
    cursor: ew-resize;
    background-image:  url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAeCAYAAADkftS9AAAAIklEQVQoU2M4c+bMfxAGAgYYmwGrIIiDjrELjpo5aiZeMwF+yNnOs5KSvgAAAABJRU5ErkJggg==');
}
.gutter {background-color: transparent;background-repeat: no-repeat;background-position: 50%;}
#overlay {
    background: #ffffff;
    color: #666666;
    position: fixed;
    height: 100%;
    width: 100%;
    z-index: 5000;
    top: 0;
    left: 0;
    float: left;
    text-align: center;
    padding-top: 25%;
    opacity: .80;
}
.spinner {
    margin: 0 auto;
    height: 64px;
    width: 64px;
    animation: rotate 0.8s infinite linear;
    border: 5px solid forestgreen;
    border-right-color: transparent;
    border-radius: 50%;
}
@keyframes rotate {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}