body {
    font-family: Arial, Helvetica;
    font-size: 15px;
}


.container {
    width: 1000px;
}

@media (max-width: 1000px) {
    .container {
        padding: 0 10%;
    }
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: "Kaushan Script";
}

#nahoru {
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 50px;
    height: 50px;
    font-size: 40px;
    background: rgba(72, 52, 42, 0.7);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 10px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.5s linear;
}

#nahoru.zobrazit {
    opacity: 1;
}