common.css

html { 
    font-size: 62%;
 }
body {
    font-family: Arial, sans-serif;
    font-size: 1.6rem;
    line-height: 3rem;
    max-width: 60vw;
    margin: 0 auto;
    padding: 2rem;
}
summary { cursor: pointer; }
pre code {
    background: #f4f4f4;
    border: 1px solid #ddd;
    border-left: 0.3rem solid #f36d33;
    color: #666;
    page-break-inside: avoid;
    font-family: monospace;
    font-size: 1.4rem;
    line-height: 1.6;
    margin-bottom: 1.6em;
    max-width: 100%;
    overflow: auto;
    padding: 1rem 1.6rem;
    display: block;
    word-wrap: break-word;
}

td, th {
    padding: 0.5rem;
}

.caption {
    font-size: 1.4rem;
    font-style: italic;
    text-align: center;
}

input:focus{
    outline: 3px solid blue;
}

textarea:focus{
    outline: 3px solid blue;
}

a:focus{
    outline: 3px solid blue;
    }

/* input type submit */
input[type=submit]{
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    margin: 1rem 0.5rem;
    cursor: pointer;
    font-size: 1.6rem;
    border-radius: 0.5rem;
}