style.css

@charset "utf-8";

/* start login page style coding*/
body {
    padding: 0;
    margin: 0;
    background-image: linear-gradient(to right, #4facfe 0%, #00f2fe 100%);
}

#login-back {
    background: linear-gradient(rgba(0, 0, 0, .4), rgba(0, 0, 0, .7)), url(photos/vo28ssjt25l21.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    width: 100%;
}

#login-container {
    width: 400px;

}

#login-back input[type='text'],
[type='password'],
[type='email'],
[type='number']::placeholder {
    font-family: fontAwesome;
    font-size: 18px;
    color: gray;
}

#login-back input[type='text'],
[type='password'],
[type='email'],
[type='number'] {
    width: 100%;
    padding: 13px;
    border: 1px solid grey;
    margin-bottom: 25px;
    outline: none;
}

/*start signup coding*/
#signup-container {
    width: 400px;
}

#signup-back {
    background: linear-gradient(rgba(0, 0, 0, .4), rgba(0, 0, 0, .7)), url(photos/vo28ssjt25l21.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    width: 100%;
}

#signup-back input[type='text'],
[type='password'],
[type='email'],
[type='number']::placeholder {
    font-family: fontAwesome;
    font-size: 18px;
    color: gray;
}

#signup-back input[type='text'],
[type='password'],
[type='email'],
[type='number'] {
    width: 100%;
    padding: 13px;
    border: 1px solid grey;
    margin-bottom: 25px;
    outline: none;
    color: white;
}