ui.css

body {
    font-family: sans-serif;
}

.tantalum-render {
    margin: 0 auto;
    margin-bottom: 4px;
    position: relative;
    width: 820px;
    height: 461px;
}

#render-canvas {
    border: none;
}

.tantalum-controls {
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
    margin-top: 0;
    max-width: 820px;
    margin-bottom: 50px;
    line-height: 1.6em;
}

.control-row {
    margin-right: -15px;
    margin-left: -15px;
}
.clearfix:after {
	visibility: hidden;
	display: block;
	font-size: 0;
	content: " ";
	clear: both;
	height: 0;
}

.warning-box, .error-box {
    padding: 10px 22px;
    border: 0;
    border-radius: 5px;
}

.warning-box>pre, .error-box>pre {
    text-align: left;
    background: rgba(255, 255, 255, 0.3);
    border: none;
    border-radius: 0;
}

.warning-box {
    color: #9F6000;
    background-color: #FEEFB3;
}
.error-box {
    color: #D8000C;
    background-color: #FFBABA;
}

.col-1-12 {  width: 8.3333333%; }
.col-2-12 {  width: 16.666667%; }
.col-3-12 {  width: 25%; }
.col-4-12 {  width: 33.333333%; }
.col-5-12 {  width: 41.666667%; }
.col-6-12 {  width: 50%; }
.col-7-12 {  width: 58.333333%; }
.col-8-12 {  width: 66.666667%; }
.col-9-12 {  width: 75%; }
.col-10-12 { width: 83.333333%; }
.col-11-12 { width: 91.666667%; }
.col-left {
    float: left;
}
.col-padding {
    margin-right: 15px;
    margin-left: 15px;
}

.control-title {
    padding-top: 20px;
    margin: 2px 0 20px;
    font: bold 23px/40px "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: #34495e;
    margin-bottom: 5px;
}

.center-tight {
    text-align: center;
}

.button-group-vert {
    display: block;
    padding: 0;
    margin: 0;
}
.button-group-horz>.button:first-child {
    margin-left: 0;
}

.button-group-vert>.button-vert:first-child:not(:last-child) {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}
.button-group-horz>.button-horz:first-child:not(:last-child) {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.button-group-vert>.button-vert:last-child:not(:first-child) {
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}
.button-group-horz>.button-horz:last-child:not(:first-child) {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.button-group-vert>.button-vert:not(:first-child):not(:last-child),
.button-group-horz>.button-horz:not(:first-child):not(:last-child) {
    border-radius: 0;
}

.button, .button-horz, .button-vert {
    font-size: 15px;
    font-weight: normal;
    line-height: 1.4;
    
    padding: 10px 13px;
    border: none;
    border-radius: 4px;
    transition: border .25s linear, color .25s linear, background-color .25s linear;
    cursor: pointer;
    
    color: #999;
    background-color: #181818;
}

.button, .button-horz {
    display: inline-block;
}
.button-vert {
    list-style: none;
    display: block;
}
.stretch-button {
    display: block;
    text-align: center;
}

.button:hover, .button-horz:hover, .button-vert:hover, .button:focus, .button-horz:focus, .button-vert:focus {
    color: #999;
    background-color: #333;
}
.button.active, .button-horz.active, .button-vert.active {
    color: #fff;
    background-color: #1F8DD6;
}

.slider, .progress {
    height: 12px;
    background-color: #181818;
    border-radius: 32px;
}

.progress {
    overflow: hidden;
}

.slider {
    position: relative;
}

.slider-bar, .progress-bar {
    height: 100%;
    font-size: 12px;
    color: #fff;
    text-align: center;
    line-height: 12px;
    background-color: #1F8DD6;
    float: left;
    width: 0;
}

.progress-bar {
    /*transition: width .2s ease;*/
}

.slider-bar {
    border-radius: 30px 0 0 30px;
}

.slider-handle {
    position: absolute;
    z-index: 2;
    width: 18px;
    height: 18px;
    top: -3px;
    margin-left: -9px;
    cursor: pointer;
    background-color: #20A6FF;
    border-radius: 50%;
    transition: background .25s;
}

.slider-label, .progress-label {
    margin-top: 2px;
    margin-bottom: 0;
    text-align: right;
    font-size: small;
}

.button-grid {
    display: flex;
}

.button-grid-column {
    flex-grow: 1;
}

.button-grid-button {
    border-radius: 0;
}
.button-grid-tl { border-top-left-radius:     4px; }
.button-grid-tr { border-top-right-radius:    4px; }
.button-grid-bl { border-bottom-left-radius:  4px; }
.button-grid-br { border-bottom-right-radius: 4px; }

.notransition {
    transition: none !important;
}

.render-loading, .render-help {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    text-align: center;
    display: flex;
    justify-content: center;
    align-content: center;
    flex-direction: column;
    cursor: default;
}

.render-loading {
    font: bold 23px "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: none;
    color: #AAA;
}
 
.render-help {
    background: black;
    color: white;
    opacity: 0.0;
    font: bold 40px "Helvetica Neue", Helvetica, Arial, sans-serif;
}

.render-help:hover {
    opacity: 0.5;
}

.render-help-transition {
    transition: opacity 0.2s ease-out;
}