body {
    height: 100%;
    align-items: center;
    display: flex;
}

h1, h2, h3 {
    text-align: center;
}

#container {
    width: 100%;
}

.row {
    display: flex;
    margin: auto auto .5rem;
}

.col {
    display: inline-block;
    margin-right: .5rem;
    width: 100%;
}

form {
    width: 50ch;
    margin: auto;
}

button[type="submit"] {
    margin: .5rem auto;
}

input {
    width: 100%;
    border: 1px solid #ccc;
    box-sizing: border-box;
}

footer {
    text-align: center;
}