h1 {
    text-align: center;
}

.dark-mode {
    background-color: black;
    color: white;
}

.button {
    background-color: grey;
    border: none;
    color: white;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
}

.top {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 30px;
}

.full {
    width: 100%;
}

.submit-button {
    background-color: grey;
    border: none;
    color: white;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
}

.input-form {
    text-align: center;
    border: none;
}

.button:hover {
    opacity: 0.5;
}

.submit-button:hover {
    opacity: 0.5;
}

ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: grey;
}

li {
    float: left;
}

li a {
    display: block;
    color: white;
    text-align: center;
    padding: 10px 25px;
    text-decoration: none;
}

li a:hover:not(.current) {
    background-color: red;
}

.current {
    background-color: blue;
}