:root{
    --button-text: white;
    --button-color: #1322aa;
    --button-border: #172884;
    font-size: 70%;
    background-color: rgba(209, 238, 253, 0.396);
} 

* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
    font-family: sans-serif;
}

header nav ul{
    display: flex;
    justify-content: space-between;
    min-width: 350px;
    font-size: 1.5rem;
    width: 100%;
    padding: 10px;
}

ul {
    list-style-type: none;
}

a {
    text-decoration: none;
    color: #269a9a;
}

main {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
}

.quiz-intro {
    text-align: center;
}

.introheader {
    margin-bottom: 20px;
}


h1, h2, h3{
    font-size: 3rem;
}

p {
    font-size: 1.7rem;
}

/* buttons */

.btn {
    font-size: 1.5rem;
    margin-top: 20px;
    width: 15rem;
    padding: 10px;
    border-radius: 5px;
    color: var(--button-text);
    background-color: var(--button-color);
    border: 0.1rem solid var(--button-border);
}

.btn:hover {
    box-shadow: 0 0.3rem 1.3rem 0 #6791f1e3;
    color: white;
}

.btn:active {
    background-color: #648be8;
    border: solid #b2ffff;
    color: white;
}

.btn[disabled]:hover {
    box-shadow: none;
    cursor: not-allowed;
}