presentex

.slide {
    display: none;

    height: 60%;
    width: 80%;

    position: absolute;
    top:0;
    bottom: 0;
    left: 0;
    right: 0;

    margin: auto;

    border-radius: 25px;
    border: 2px solid #8AC007;
    padding: 20px;
}

body {
  font-size: 18px;
}

h1,h2,h3,h4,h5,h6,p {
 line-height: 1;
 margin: 0;
 text-align: center;
}

h1 { font-size: 4em; }
h2 { font-size: 3.5em; }
h3 { font-size: 3em; }
h4 { font-size: 2.5em; }
h5 { font-size: 2em; }
h6 { font-size: 1.5em; }

pre {
  height: 100%;
  margin: 0;
  padding: 0;
  font-size: 1em;
}

code {
  height: 100%;
  margin: 0;
  padding: 0;
}

.slide code {
  margin: 0;
  padding: 0;
}

ul {
  margin-left: 30%;
}

blockquote:before {
  content: "\"";
  font-size: 2em;
  color: gray;
}

blockquote:after {
  content: "\"";
  font-size: 2em;
  color: gray;
}

.author:before {
  content: "- ";
}

.author {
  margin-left: 60%;
}