header{
	width: 100%;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 80px;
	position: fixed;
    top: 0;
    background: rgba(54,159,255,0.6);
    z-index: 999;
}

#logo{
    width: 220px;
    max-width: 220px;
    min-width: 150px;
}

img{
    width: 100%;
}

nav{
    position: relative;   
}

nav ul {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
}

nav li {
	padding: 10px 10px;
    text-align: center;
    margin: 0 auto;
}

nav li#cuadro{
	border: 1px solid white;
}

nav li a{
	text-decoration: none;
    font-weight: 800;
    transition: all 0.8s;
    padding: 5px 10px;
    border-radius: 2px;
    color: white;
    font-size: 16px;
}

nav li a:hover{
    color: rgba(255,255,255,0.5);
}

a.arriba{
    opacity: 1;
    transition: all 0.8s;
}

a.arriba:hover{
    opacity: 0.6;
}