#preloader {
    position: absolute;
    top: 0px;
    margin: 0px auto;
    display: none;
    text-align: center;
    width: 100%;
    height: 100%;
    background-color: rgba(255,255,255, .9);
}


.canvas-backdrop {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1040;
    opacity: 0.8;
}

.sk-rotating-plane {
    width: 40px;
    height: 40px;
    margin: 40px auto;
    -webkit-animation: sk-rotatePlane 1.2s infinite ease-in-out;
    animation: sk-rotatePlane 1.2s infinite ease-in-out;
}

.vertical_center {
    top: 50%;
    transform: translate(-50%,-50%);
    position: absolute;
    margin-left: auto;
    margin-right: auto;
    left: 50%;
}

@-webkit-keyframes sk-rotatePlane {
    0% {
        -webkit-transform: perspective(120px) rotateX(0deg) rotateY(0deg);
        transform: perspective(120px) rotateX(0deg) rotateY(0deg);
    }

    50% {
        -webkit-transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg);
        transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg);
    }

    100% {
        -webkit-transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
        transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
    }
}

@keyframes sk-rotatePlane {
    0% {
        -webkit-transform: perspective(120px) rotateX(0deg) rotateY(0deg);
        transform: perspective(120px) rotateX(0deg) rotateY(0deg);
    }

    50% {
        -webkit-transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg);
        transform: perspective(120px) rotateX(-180.1deg) rotateY(0deg);
    }

    100% {
        -webkit-transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
        transform: perspective(120px) rotateX(-180deg) rotateY(-179.9deg);
    }
}

body.dark,
body.contrast {
    color:#ffffff;
}

body.dark .ui-widget-content {
    color: #ffffff;
    background:#2f2f2f;
}

body.contrast .ui-widget-content {
    color: #ffffff;
    background:#000000;
}