* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 32px;

    max-width: 960px;

    font-family: sans-serif;
}

.demo-sections {
    display: flex;
    flex-direction: column;
}

@media (min-width: 640px) {
    .demo-sections {
        flex-direction: row;
    }

    .no-qt-section {
        padding-left: 64px;
    }
}

.demo {
    display: inline-block;

    cursor: pointer;
    padding: 16px 32px;

    border: 2px solid #eee;
    border-radius: 8px;

    user-select: none;

    -webkit-tap-highlight-color: transparent;
}

.demo.active,
.demo:not(.qt):active {
    background: #eee;
}

.demo-animated {
    transition: background-color 180ms linear;
}

.demo-animated.active,
.demo-animated:not(.qt):active {
    transition: none;
}

.demo-material {
    border-radius: 4px;

    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);

    background: #2196F3;
    color: #fff;

    border: none;

    transition-property: transform, background;
    transition-duration: 180ms;
    transition-timing-function: cubic-bezier(0.165, 0.84, 0.44, 1);

    will-change: transform, background;
}

.demo-material.active,
.demo-material:not(.qt):active {
    background: #64B5F6;
    transform: scale(1.05);
}