@font-face {
    font-family: robotomono;
    src: url(RobotoMono-VariableFont_wght.ttf);
}

body {
    font-family: robotomono;
    font-size: 2vh;
    line-height: 1.25;
    background-color:rgb(245, 245, 245);
    margin: 0px 0px;
    width: fixed;
    display: flex;
    flex-wrap: wrap;
}

main {
    width: 100%;
    height: 100%;
}

header {
    height: 7vh;
    width: 100%;
    padding-top: 4vh;
}

section {
    width: 100%;
}

div {
    display: inline-block;
    float: left;
}

/* divisions del menu superior */

.logo {
    width: 80%;
}
.logo img {
    max-height: 7vh;
    padding-left: 4%;
}
.menu {
    width: 20%;
}
.submenu {
    height: calc((100%)/3);
    width: 100%;
}
.submenu a {
    float: right;
    padding-top: 2px;
    padding-bottom: 2px;
    padding-right: 15%;
    color: black;
    text-align: center;
    text-decoration: none;
}
.submenu a:hover {
    color:black;
    text-decoration: underline;
}

/* divisions del menu superior */

.grid {
    padding-top: 11vh;
    width: 100%;
    -webkit-column-count: 4;
    -moz-column-count: 4;
    column-count: 4;
    -webkit-column-width: 45vh;
    -moz-column-width: 45vh;
    column-width: 45vh;
}
.grid a {
    color: black;
}
.grid div {
    position: relative;
}
.grid div div {
    position: absolute;
    top: 40%;
    left: 0;
    right: 0;
    text-align: center;
    opacity: 0;
    visibility: hidden;
}
.grid div:hover div {
    visibility: visible;
    opacity: 1;
}
.grid div:hover img {
    opacity: 0.4;
}
.grid:after {
    content:'';
    display: inline-block;
    clear: both;
}
.a {
    max-width: 45vh;
    max-height: 45vh;
    float: left;
    padding-left: 3%;
    padding-right: 3%;
    padding-bottom: 5%;
    padding-top: 5%;
}
.a img {
    max-width: 45vh;
    max-height: 45vh;
    width: 96%;
    padding-left: 2.0%;
}
.b {
    max-width: 45vh;
    max-height: 45vh;
    float: left;
    padding-left: 3%;
    padding-right: 3%;
    padding-bottom: 5%;
    padding-top: 5%;
}
.b img {
    max-width: 45vh;
    max-height: 45vh;
    width: 88%;
    padding-left: 6.0%;
}
.c {
    max-width: 45vh;
    max-height: 45vh;
    float: left;
    padding-left: 3%;
    padding-right: 3%;
    padding-bottom: 5%;
    padding-top: 5%;
}
.c img {
    max-width: 45vh;
    max-height: 45vh;
    width: 99%;
    padding-left: 0.5%;
}
.d {
    max-width: 45vh;
    max-height: 45vh;
    float: left;
    padding-left: 3%;
    padding-right: 3%;
    padding-bottom: 5%;
    padding-top: 5%;
}
.d img {
    max-width: 45vh;
    max-height: 45vh;
    width: 81%;
    padding-left: 9.5%;
}
.e {
    max-width: 45vh;
    max-height: 45vh;
    float: left;
    padding-left: 3%;
    padding-right: 3%;
    padding-bottom: 5%;
    padding-top: 5%;
}
.e img {
    max-width: 45vh;
    max-height: 45vh;
    width: 80%;
    padding-left: 10.0%;
}
.f {
    max-width: 45vh;
    max-height: 45vh;
    float: left;
    padding-left: 3%;
    padding-right: 3%;
    padding-bottom: 5%;
    padding-top: 5%;
}
.f img {
    max-width: 45vh;
    max-height: 45vh;
    width: 94%;
    padding-left: 3.0%;
}
.g {
    max-width: 45vh;
    max-height: 45vh;
    float: left;
    padding-left: 3%;
    padding-right: 3%;
    padding-bottom: 5%;
    padding-top: 5%;
}
.g img {
    max-width: 45vh;
    max-height: 45vh;
    width: 88%;
    padding-left: 6.0%;
}
.h {
    max-width: 45vh;
    max-height: 45vh;
    float: left;
    padding-left: 3%;
    padding-right: 3%;
    padding-bottom: 5%;
    padding-top: 5%;
}
.h img {
    max-width: 45vh;
    max-height: 45vh;
    width: 99%;
    padding-left: 0.5%;
}
.i {
    max-width: 45vh;
    max-height: 45vh;
    float: left;
    padding-left: 3%;
    padding-right: 3%;
    padding-bottom: 5%;
    padding-top: 5%;
}
.i img {
    max-width: 45vh;
    max-height: 45vh;
    width: 92%;
    padding-left: 4.0%;
}
.j {
    max-width: 45vh;
    max-height: 45vh;
    float: left;
    padding-left: 3%;
    padding-right: 3%;
    padding-bottom: 5%;
    padding-top: 5%;
}
.j img {
    max-width: 45vh;
    max-height: 45vh;
    width: 87%;
    padding-left: 6.5%;
}
.k {
    max-width: 45vh;
    max-height: 45vh;
    float: left;
    padding-left: 3%;
    padding-right: 3%;
    padding-bottom: 5%;
    padding-top: 5%;
}
.k img {
    max-width: 45vh;
    max-height: 45vh;
    width: 83%;
    padding-left: 8.5%;
}