body {
    background: rgb(36, 36, 36);
    color: white;
    font-family: Helvetica Neue, Halvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
}
a.btn {
    color: white;
    background-color: gray;
    border: 10px solid gray;
    border-radius: 10%;
}
a.btn:hover {
    border: 12px solid gray;
}
header {
    background: black;
    background-image: url("images/hero.png");
    background-size: 100%;
    height: 300px;
    padding: 20px 10px;
    text-align: center;
}
section {
    background: rgb(57, 57, 57);
    color: rgb(255, 251, 251);
    padding: 20px;
    display: flex;
    flex-direction: row;
}
div {
    margin: auto;
    width: auto;
}
div.bottom {
    margin: auto;
}


ul {
    margin: 0;
    padding: 0;
    list-style-type: none;
}
footer {
    background: black;
    padding: 10px 20px;
}
li.nav {
    display: inline-block;
    margin-left: 10px;
    border-radius: 3px;
    padding: 3px;
}
li.logodesk {
    background-image: url("images/logo.png");
    background-size: 25px;
    background-position: right;
    background-position-y: 5px;
    background-position-x: 20px;
    background-repeat: no-repeat;
    display: inline-block;
    padding: 10px;
    border-radius: 3px;
    position: relative;
    width: 25px;
    height: 25px;
    text-indent: -9999999px;
}

li.nav:first-child{
    margin-left: 0;
}
li.nav:hover{
    background-color: red;
}

a:hover {
    text-decoration: underline;
}
a {
    text-decoration: none;
    color: white;
}
a:active {
    color: greenyellow;
}
li.logomobile {
    display: none;
}

footer.fotter {
    text-align: left;
}

/* RESPONSIVE RULES */
@media screen and (max-width: 515px) {
    header {
        height: 200px;
    }
    div {
        width: 400px;
    }
}
@media screen and (max-width: 365px) {
    header {
        height: 100px;
    }
}

@media screen and (max-width: 295px) {
    li.logodesk {
        display: none;
    }
}