* {
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    background-color: #0174DF;
}

header {
    height: 5%;
    background-color: #045FB4;
    color:  darkblue;
    font-family: 'Pacifico', cursive;
    text-align: center;
    width: 100%;
    margin: auto;
}

nav {
    height: 4%;
    background-color: cornflowerblue;
    border-top: 1px solid white;
   
}
nav ul li {display: inline-block;}
header h1 {
    text-align: center;
    text-shadow: 1px 2px 1px grey;
}

section {
    width: 70%;
    height: 60%;
    background-color: white;
    margin: auto;
    position: relative;
    top: 5%;
    border-radius: 15px;
    box-shadow: 4px 4px 2px black;
    padding: 10px;
}


#a{
    padding:7px 3px 15px 3px;
    background-color:  gold;
    font-family: 'Lobster', cursive;
    color:   midnightblue;
    text-decoration: none;
}
nav ul li a{
    text-decoration:none;
}
#b{
    padding:7px 3px 15px 3px;
    background-color: gray;
    font-family: 'Lobster', cursive;
    color:  dodgerblue;
    text-decoration: none;
}
.celda{
    border-radius: 4px;
    background-color:  chartreuse;
    text-align: center;
}
img{
    height: 50%;
    width: 50%;
    margin: auto;
    position: relative;
    left: 20%;
    
}