.container{
    background: #40c9c9;
    width: 300px;
    padding: 20px;
    margin: 0 auto; /*esq/dir segue align do h1 */
    border-radius: 5px;
}

h1{
    text-align: center;
}

footer{
    text-align: center;
    margin-top: 25px;
}

a{
    text-decoration: none;
    color: #111;
}

input[type=button]{
    background: #fff;
    border: none;
}

input[type=number]{
    width: 200px;
}