body {
    background: url(bg.png);
    background-size: 100vw;
}

.form {
    width: 21.9%;
    margin-top: 8.83%;
    margin-left: 56.4%;
}

.form-username,
.form-password {
    display: block;
    width: 100%;
    height: 3.2vw;
    padding: 0 16px;
    margin-bottom: 0.6vw;
    border: 1px solid #dddfe2;
    border-radius: 6px;
    font-size: 17px;
}

.form-submit {
    width: 100%;
    height: 2.85vw;
    margin-top: 0.3vw;
    background-color: #1877f2;
    border: none;
    border-radius: 6px;
    color: #fff;
    font-size: 20px;
    font-weight: 700;
    cursor: pointer;
}