main {
    font-size:1em;
}

ul {
    padding: 0;
}

.button {
    display: block;
    height: 1.5em;
    width: 15em;
    background-color: blue;
    margin-bottom: 1.25em;
    border-radius: 0.25em;
    text-align: center;
    color: #cdcdcd;
    font-size: 1.5em;
}

a {
    text-decoration: none;
}

ul li {
    list-style-type: none;
}

h2 {
    font-size: 3em;
}

h3 {
    font-size: 2em;
}

p {
    font-size: 1.5em
}

.heading {
    display: block;
    margin-top: 5em;
}

footer {
    margin-top: 5em;
    font-size:0.5em;
    color: #aaa;
}