style.css

body {
  color: #212121;
  font-family: "Helvetica Neue", "Calibri Light", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: 0.02em;
  background: #ceeef0;
  font-size: 16px;
}

body.logged-in {
  padding-top: 60px;
}

.ui.top.menu .item img {
  border-radius: 4px;
}

.small {
  font-size: 14px;
}

#header-graphic {
  max-width: 700px;
  margin-top: -60px;
  margin-bottom: -80px;
  z-index: -1000;
  position: relative;
}
#header-graphic img {
  max-width: 700px;
  width: 100%;
}

.single-column {
  margin: 0 auto; 
  max-width: 700px;
}

section.content {
  padding: 10px;
  border-radius: 4px;
  border: 1px #abcce9 solid;
  background: #fff;
  margin-bottom: 12px;
}

section.content h4 {
  margin: 0;
  margin-top: 1em;
}

@media(max-width: 616px) {
  section.content {
    margin-left: 8px;
    margin-right: 8px;
  }
}

section.content textarea {
  border: 1px #abcce9 solid;
  border-radius: 4px;
  -webkit-box-shadow: inset 0px 0px 6px 2px #e0edf9;
  -moz-box-shadow: inset 0px 0px 6px 2px #e0edf9;
  box-shadow: inset 0px 0px 6px 2px #e0edf9;
  min-height: 200px;
  width:100%;
}

h1{text-align:center;}
.button{width:100%;}
section.result{margin-top:10px; border:1px solid black;}
section.warn{background-color:#ffc;}
section.warn:before{content:'Warning: '; font-weight:bold;}
section.error{background-color:#fcc;}
section.error:before{content:'Error: '; font-weight:bold;}
section.success{background-color:#cfc;}

.result .errorline{
    display:none;
    font-size:14px;
}

.result .expander-label{
    float:right;
}
.result .expander-check{
    display:none
}
.result .expander-check:checked ~ .errorline{
    display:block;
}