style.css

body {
    margin: 0;
    padding: 0;
    border: 0;
    width: 100vw;
    height: 100vh;

    display: flex;
    align-items: center;
    justify-content: center;

    background-color: #fb3;
    color: #1c282b;
    font-family: 'Noto Sans', sans-serif;
}

form {
    margin: 0;
    padding: 2rem;
    border: 0;
    border-radius: 0.2rem;
    width: 13rem;
    height: auto;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;

    background-color: #fff;
    filter: drop-shadow(0 0 1rem #0002);
}

form h1 {
    margin: 0;
    width: 100%;

    font-size: 1.5rem;
}

form h2 {
    margin: 0;
    width: 100%;

    font-size: 1.05rem;
}

form a {
    text-decoration: none;
    color: #489;
}

form p {
    margin: 1rem 0;
    width: 100%;
    font-size: 1.0rem;
}

form ul {
    margin: 0.2rem 0 1.2rem;
    padding: 0;
    border: 0;
    width: 100%;
    list-style: none;
}

form ul li{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

form ul li span{
    width: auto;
}

form span {
    width: 100%;
    font-size: 0.9rem;
}

form label {
    width: 100%;
    font-size: 0.9rem;
}

form input {
    margin: 0.3rem 0;
    padding: 0 0.4rem;
    width: 100%;
    height: 2rem;
    box-sizing: border-box;
}

form input[type="submit"] {
    margin: 0.5rem 0 0;
    border: 0;
    border-radius: 0.2rem;
    cursor: pointer;
    font-size: 0.95rem;
    color: #fff;
    background-color: #489;
}