custom.css

.highlight {
    font-weight: 700;
}

.background-image {
    background-position: center;
    background-size: contain;
    background-repeat: no-repeat;
}

.center-content {
    position: relative;
}

.center-content > *{
    display: inline-block;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.slide .title-slide {
    font-weight: 700;
    font-size: 60px;
}

.slide pre {
    white-space: pre;
}

.slide.prism {
    padding-top: 50px;
}

.slide.prism h2 {
    float: right;
    padding-top: 0;
    z-index: 10;
    position: relative;
}

.a-lot-of-code pre {
    bottom: 50px;
    top: 50px;
    right: 0;
    left: 50px;
    position: absolute;
    overflow-y: scroll;
}

.a-lot-of-code h2 {
    position: relative;
    z-index: 100;
}

.text-center * {
    text-align: center;
    margin: 0 auto;
    display: block;
}

.slide.text-center h2 {
    margin-bottom: 0px;
}

.subtitle {
    margin-bottom: 15px;
    font-size: 30px;
}

.copyright a {
    font-size: 7pt;
    color: #999;
    text-decoration: none;
    background: none;
}

.new-code {
    background-color: #fdffca;
    display: inline-block;
    margin: 0 -8px;
    padding: 0 8px;
    border-radius: 10px;
}

.slide {
    padding: 70px 100px 0;
}

.slide.times {
    padding: 30px 50px 0;
}

.slide.times img{
    width: 100%;
    height: auto;
}

.slide.times .title-slide {
    position: absolute;
    margin-top: 15px;
}

.stage {
    position: absolute;
    right: 0;
    bottom: 0;
    padding: 15px 30px 30px;
    color: white;
    background-color: #f7302f;
}