* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    background-color: var(--polonium-black);
    color: var(--polonium-green);
}

h1 {
    text-align: center;
}

main {
    width: 100vw;
    max-width: 450px;

    background-color: var(--polonium-gray);

    margin-top: 20vh;
    margin-inline: auto;

    padding-block: 4rem;
    padding-inline: 1rem;

    border-radius: 1rem;
    border: 1px solid var(--polonium-green);
}

input {
    width: 100%;
    height: 2rem;

    background-color: var(--polonium-green);

    display: block;
    margin-block: 1rem;
    margin-inline: auto;

    padding: 1.2rem;

    font-size: 1.2rem;
    text-align: center;

    border: 2px solid var(--polonium-black);
    border-radius: .5rem;
    
        
}

button {
    width: 100%;
    height: 3rem;
    
    display: block;
    margin-block: 1rem;
    margin-inline: auto;

    font-size: 1.2rem;
    text-align: center;

    background-color: var(--polonium-green-solid);

    border-radius: .5rem;
    border: 2px solid var(--polonium-black);
}

.d-none {
    display: none;
}

#error {
    color: var(--polonium-error);
    font-weight: bold;
    text-align: center;
    text-shadow: 0px 0px 3px var(--polonium-black);
}