style.css

* {
    box-sizing: border-box;
}

body {
    font-family: sans-serif;
    margin: 2em 1em;
    line-height: 1.5em;
}

h1 {
    font-weight: 900;
    color: #ff9e4a;
    line-height: 1.1;
    font-size: 3em;
}

form {
    background-color: #eee;
    border: #C1C1C1 solid 1em;
    display: grid;
    grid-gap: 1em;
    padding: 1em;
    max-width: 80%;
    max-height: 60%;
}

label {
    font-style: italic;
    font-size: 1.5em;
}

.center {
    text-align: center;
}

.otherCenter {
    margin-left: auto;
    margin-right: auto;
}

form button {
    display: inline;
    background-color: #bbbbf2;
    border: 2px solid currentColor;
    border-radius: 0.25em;
    cursor: pointer;
    font-size: inherit;
    line-height: 1.4em;
    padding: 0.25em 1em;
    max-width: 20ch;
}

form button:hover {
    background-color: lavender;
}

#breed {
    font-size: 1.5em;
}

#btn {
    font-size: 1.25em;
}

footer {
    margin-top: 3em;
    padding-top: 1.5em;
    border-top: 1px solid lightgrey;
}