style.css

/* https://css-tricks.com/box-sizing/ */
html {
    box-sizing: border-box;
    font-family: Helvetica, Arial, sans-serif;
}
*, *:before, *:after {
    box-sizing: inherit;
}

body {
    background-color: pink;
    margin: 0 auto;
    max-width: 640px;
}

h1 {
    font-family: 'Comic Sans MS', cursive, sans-serif;
    font-weight: bold;
    color: aquamarine;
    text-shadow: black 3px 3px;
    font-size: 32pt;
}

.site-header-link {
    text-decoration: none;
}

.header-subtitle {
    font-family: 'Comic Sans MS', cursive, sans-serif;
    text-decoration: none;
    color: aquamarine;
    text-shadow: black 1px 1px;
}

h2 {
    margin: 0;
    font-size: 20px;
}

h3 {
    font-size: 16px;
}

section {
    background-color: #fff4f6;
    padding: 20px;
}

article {
    margin-top: 30px;
    font-size: 12pt;
}

table {
    border-collapse: collapse;
    /* https://developer.mozilla.org/en-US/docs/Web/CSS/border-collapse */
}

th {
    border: 3px solid black;
    margin: 0;
    padding: 0;
}
td {
    border: 1px solid black;
    margin: 0;
    padding: 0;
}

footer {
    background-color: #fff4f6;
}

.marquee {
    background-color: black;
    overflow: hidden;
}

/* https://www.quackit.com/css/codes/marquees/ */
.marquee-text {
    font-family: 'Comic Sans MS', cursive, sans-serif;
    /* Starting position */
    transform:translateX(100%);
    /* Apply animation to this element */
    animation: marquee-animation 15s linear infinite;
    color: aquamarine;
    overflow: visible;
    white-space: nowrap;
}

@keyframes marquee-animation {
 0%   {
 transform: translateX(100%);
 }
 100% {
 transform: translateX(-100%);
 }
}

#html5-validator {
    height: 31px;
}

.construction-sign {
    margin: 0 20px;
    height: 64px;
}