index.css

html, body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
}

img.macaca {
    max-width: 100%;
    height: auto;
  }

header {
    border-left: 1em;
}

main {
    flex: 1 0 auto;
    margin: auto;
    width: 90%;
}

.slider {
    width: 70%;
}

.config-name {
    width: 10em;
}

.config {
    width: 4em;
}

.instruction-banner {
    margin: auto;
    width: 100%;
    min-height: 15rem;
    text-align: center;
    text-transform: uppercase;
    vertical-align: middle;
}

.visible {
    visibility: visible;
    opacity: 1;
}

.hidden {
    visibility: hidden;
    opacity: 0;
    transition: visibility 0s 0.3s, opacity 0.3s linear;
}

footer {
    flex-shrink: 0;
    width: 90%;
}

/* FIXME: one day we should use Sass and configure primary/secondary colors there */
a {
    color: #89c060;
}

a:hover {
    color: #89d060;
}

.text-macaca {
    color: #fff;
}

.bg-macaca-dark {
    background-color: #1b3220;
}

.btn-macaca {
    color: #fff;
    background-color: #89c060;
    border-color: #89c060;
}

.btn-macaca:hover {
    color: #fff;
    background-color: #89d060;
    border-color: #89d060;
    cursor: pointer;
}

.badge-macaca {
    background-color: #1b3220;
}

.slider::-webkit-slider-thumb {
    background: #1b3220;
}

.slider::-moz-range-thumb {
    background: #1b3220;
}

.slider::-ms-thumb {
    background: #1b3220;
}