/*estilos generales*/
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
}
body{
	background-size: 120%;  
}
nav ul{
	list-style: none;
	padding:0;
}
nav li{
	line-height: 3rem;
	position: relative;
}
nav li ul{
	position: absolute;
	border-top: 3px brown solid;
}
nav a {
	color: #ddd;
	display: block;
	padding: 0 2.5em;
	text-decoration: none;
	transition: .4s;
}
nav a:hover{
	background: rgba(0, 0, 0, .5);
}
nav li ul{
  display: none;	
}
nav li:hover ul{
	display: block;
}

/*primer nivel hijos del nav*/
nav >ul{
	background: #333;
	display: table;
	width: 75%;
}
nav > ul > li{
	float: left;

}
/*segundo nivel*/
nav li li{
	background: #222;
}
.card {
    position: relative;
    width: 400px;
    height: 350px;
    margin: 20px;
}

.card .face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 10px;
    overflow: hidden;
    transition: .5s;
}

.card .front {
    transform: perspective(600px) rotateY(0deg);
    box-shadow: 0 10px 10px #000;
}

.card .front img {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card .front h3 {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 45px;
    line-height: 45px;
    color: #fff;
    background: rgba(0,0,0,.4);
    text-align: center;
}

.card .back {
    transform: perspective(600px) rotateY(180deg);
    background: rgb(3, 35, 54);
    padding: 15px;
    color: #f3f3f3;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-align: center;
    box-shadow: 0 5px 10px #000;
}

.card .back .link {
    border-top: solid 1px #f3f3f3;
    height: 50px;
    line-height: 50px;
}

.card .back .link a {
    color: #f3f3f3;
}

.card .back h3 {
    font-size: 30px;
    margin-top: 20px;
    letter-spacing: 2px;
}

.card .back p {
    letter-spacing: 1px;
} 

.card:hover .front {
    transform: perspective(600px) rotateY(180deg);
}

.card:hover .back {
    transform: perspective(600px) rotateY(360deg);
}