ul.menu {
    list-style: none;
    margin-left: 25px;
}

li.menu-item {
    display: inline-block;
    margin-right: 10px;
    cursor: pointer;
}

header {
    background: black;
    color: white;
    transition: opacity 1s ease;
    opacity: 1;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    line-height: 80px;
    transition: all 0.5s ease;
}

header a {
    color: white;
    text-decoration: none;
}

header:hover {
    opacity: 1;
}

.fade {
    opacity: 0.7;
}

@media only screen and (max-width: 768px) {
    .fade {
        opacity: 1;
    }
}

.scrolled {
    height: 50px;
    line-height: 30px;
}

section {
    /*max-width: 600px;*/
    padding: 0 25px;
    margin: 0 auto;
    margin-top: 150px;
    font-size: 1.2em;
    line-height: 1.5;
}

h1,
li a,
footer p {
    font-family: 'Montserrat', sans-serif;
    text-transform: uppercase;
}

h1 {
    border-bottom: 1px solid #ccc;
}

footer {
    background: black;
    color: white;
    padding: 15px;
    text-align: center;
    margin-top: 45px;
    height: 100px;
}

.progress-bar {
    width: 52px;
    height: 52px;
    position: fixed;
    bottom: 30px;
    right: 30px;
    visibility: hidden;
    opacity: 0;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    transition: all 0.3s;
}

.btn-top {
    font-size: 25px;
    height: 40px;
    width: 60px;
    line-height: 60px;
    position: fixed;
    right: 27px;
    bottom: 28px;
    color: rgba(77, 91, 109, 0.8);
    text-align: center;
    text-decoration: none;
}

.is-visible {
    /* the button becomes visible */
    visibility: visible;
    opacity: 1;
}