html,
body {
    padding: 0;
    margin: 0;
    width: 100%;
    height: 100%;
}

.app {
    position: relative;
    box-sizing: border-box;
    height: calc(100% - 60px);
    padding: 30px;
}

.panel {
    box-sizing: border-box;
    height: 100%;
    background: #fff;
    display: flex;
    border-radius: 3px;
}

.sidebar {
    flex: 0 0 320px;
    padding: 0 20px;
    color: #555;
    line-height: 1.5;
}
.sidebar .notes {
    font-size: 13px;
    color: #888;
}

.viewer {
    position: relative;
    flex: 1 1 auto;
    background: #ccc;
}

#api-frame {
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.options,
.select {
    display: block;
    position: absolute;
    left: 50%;
    bottom: 15px;
    transform: translate(-50%);
    z-index: 1;
    margin: 0;
    padding: 0;
}
.select {
    bottom: 20px;
}

.options__option {
    display: inline-block;
    position: relative;
}

.options__option input {
    opacity: 0;
    position: absolute;
}

.options__option span {
    display: inline-block;
    margin: 0 10px;
    width: 40px;
    height: 40px;
    border: 4px solid transparent;
    border-radius: 50%;
    text-indent: -1000px;
    overflow: hidden;
    cursor: pointer;
    background: #000;
}

.options__option input:checked + span {
    border: 4px solid white;
}
.options__option span[class*='green'] {
    background: #80b845;
}
.options__option span[class*='red'] {
    background: #c74334;
}
.options__option span[class*='blue'] {
    background: #2c4463;
}
.options__option span[class*='lightblue'] {
    background: #70c0e7;
}