html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    background: #333
}

.displayNone {
    display: none;
}

#app {
    width: 100%;
    height: 100%;
    margin: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: #333
}

#header,
#footer,
#content button {
    padding: 5pt;
    margin: 5pt;
    border-radius: 10px;
    font-size: 5vmin
}

#header {
    display: flex;
    flex-direction: column;
    padding: 5px;
    background: red
}

#radioName,
#radioStat,
#volLevel {
    margin: auto;
}

#content {
    overflow: auto;
    margin: 5px;
    flex: 1;
    background: #333
}

#content button {
    display: block;
    width: 98%;
    text-align: left;
    font-size: 10vmin
}

#content :nth-child(even) {
    background: #777;
}

#content :nth-child(odd) {
    background: #aaa;
}

#content .selected {
    text-align: center;
    background: green;
}

#footer {
    display: flex;
    padding: 5px;
    background: blue;
}

#volDown {
    font-weight: bold;
    font-size: 3em;
    margin-right: 0.2rem
}

#volFader {
    flex: 1 1 auto;
    background: green;
    display: flex
}

#volUp {
    font-weight: bold;
    font-size: 3em;
    margin-left: 0.2rem
}

#playPause {
    font-weight: bold;
    font-size: 12vmin;
    margin-left: 0.3rem;
}