style.css

@charset 'utf-8';

* {
    box-sizing: border-box;
}
h1, h2, h3, h4, h5, h6 {
    margin: 0;
}
body {
    line-height: 175%;
}
h1 {
    margin-left: 1rem;
}
ul {
    list-style: none outside;
}
ol.passwords {
    list-style: decimal outside;
    display: inline-block;
    padding: 1rem 1rem 1rem 2rem;
    margin-left: 2rem;
    margin-bottom: 0.75rem;
}
.char-list li:first-of-type {
    display: block;
}
.char-list li {
    display: inline-block;
    margin-right: 1rem;
    min-width: 3rem;
}
.content {
    padding: 1rem 1rem;
}
.notice {
    display: inline-block;
    outline: #F00 solid 1px;
    padding: 0.25rem 1rem;
    margin-left: 1rem;
    color: #F00;
}
.number_of_characters,
.number_of_passwords {
    width: 4rem;
}
.option {
    display: inline-block;
    outline: #333 solid 1px;
    padding: 1rem;
    margin-right: 0.5rem;
    margin-bottom: 0.75rem;
}