signup.css

/* Bordered form */
html {
    height: 100%;
    background-color: #2c2c2c;
}

form {
    margin-top: 200px;
}

/* Full-width inputs */
input[type=text], input[type=password] {
    width: 100%;
    padding: 12px 20px;
    margin: 8px 0;
    display: inline-block;
    border: 1px solid #ccc;
    box-sizing: border-box;
}

/* Set a style for all buttons */
button {
    background-color: #4CAF50;
    color: white;
    padding: 14px 20px;
    margin: 8px 0;
    border: none;
    cursor: pointer;
    width: 100%;
}
.new {
    float: right;
    color: whitesmoke;
    margin-top: 10px;
    margin-bottom: -10px;
}
/* Change color of username and password label */
.username, .password, .remember, .name, .signup{
    color: whitesmoke;
}

.signup {
    margin-left: 47%;
}

/* Extra style for the cancel button (red) */
.cancelbtn {
    width: auto;
    padding: 10px 18px;
    background-color: #f44336;
}

/* Add padding to containers */
.container {
    padding: 16px;
    width: 30%;
    margin-top: -30px;
}

/* The "Forgot password" text */
span.psw {
    float: right;
    padding-top: 16px;
}

.cancelbtn {
        width: 100%;
    }


@media screen and (min-width: 800px) {
    .container {
        width: 30%;
    }
}

@media screen and (max-width: 800px) {
     .container {
    width: 50%;  
    }
}

@media screen and (max-width: 600px) {
    .container {
    width: 75%;
    }
}

@media screen and (max-width: 450px) {
    .container {
    width: 90%;
    }
}

/* Change styles for span and cancel button on extra small screens */
@media screen and (max-width: 300px) {
    span.psw {
        display: block;
        float: none;
    }
    
    .container {
    width: 100%;
    }
}