html, body {
    height: 100%;
    background-color: #FFFFFF;
}

form {
    width: 40%;
    margin: 20px auto;
    border: 2px solid #3BAFFA;
    border-radius: 20px;
    text-align: center;
}

.title {
    text-align: center;
    font-size: x-large;
}

.tips {
    font-size: 0.5rem;
    margin: 0;
}

form input {
    height: 38px;
    width: 300px;
    margin: 20px auto 0 auto;
    font-size: large;
    border-radius: 5px;
}


button {
    height: 38px;
    width: 305px;
    margin: 1rem auto;
    font-size: large;
    border-radius: 5px;
    background-color: #3BAFFA;
    text-align: center;
}

button:disabled {
    background-color: lightgray;
}