:root {
    --accent: #4ea8a8;
    --errorBorder: #b4547b;
    --errorRgb: rgba(180, 84, 123, 0.5);
}

* {
    box-sizing: border-box;
    line-height: 125%;
    margin: 0;
    padding: 0;
}

html {
    height: 100%;
}

body {
    background-image: url('wallpaper.jpg');
    background-size: cover;
}

body,
input {
    font-family: 'Noto Sans', sans-serif;
    font-size: 16px;
}

div#container {
    background-color: rgba(255, 255, 255, 0.5);
    border: 2px solid white;
    border-radius: 10px;
    left: 50%;
    padding: 25px;
    position: fixed;
    top: 50%;
    transform: translate(-50%, -50%);
}

div#container h1 {
    padding: 0 30px;
    text-align: center;
}

input {
    border-radius: 5px;
    margin-top: 25px;
    padding: 5px;
    width: 100%;
}

input[type='text'],
input[type='email'],
input[type='password'] {
    background-color: rgba(255, 255, 255, 0.5);
    border: 2px solid rgba(255, 255, 255, 0);
}

input.error,
input:invalid {
    background-color: var(--errorRgb, red);
    border-color: var(--errorBorder, red);
    box-shadow: none;
}

input[type='button'] {
    background-color: var(--accent);
    border: none;
    color: white;
}

input[type='button']:disabled {
    background-color: var(--errorBorder, red);
    cursor: not-allowed;
}