label {
    display: block;
    font: .9rem 'Fira Sans', sans-serif;
}

input[type='submit'],
label {
    margin-top: 1rem;
}

body{
    /*width: 500px;*/
    margin: auto;
    width: 80%;
    padding: 10px;
    font-family: Courier New,Courier,Lucida Sans Typewriter,Lucida Typewriter,monospace; 
}

pre {
    background: #f4f4f4;
    border: 1px solid #ddd;
    border-left: 3px solid #f36d33;
    color: #666;
    page-break-inside: avoid;
    font-family: monospace;
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 1.6em;
    overflow: auto;
    padding: 1em 1.5em;
    display: block;
    word-wrap: break-word;
}

.column-left{ float: left; width: 32%; padding: 0.5%;}
.column-right{ float: right; width: 32%; padding: 0.5%;}
.column-center{ display: inline-block; width: 32%; padding: 0.5%;}

#puzzle-e {
    padding-top: 50px;
}

.center {
  margin: auto;
  width: 50%;
  padding: 10px;
}