*{margin:4; padding: 0; box-sizing: border-box;}


.titulo { background: #afeee4;
    background: linear-gradient(90deg, rgb(48, 192, 217) 0%, rgb(46, 163, 144) 50%, rgb(17, 74, 128) 100%);
    padding: 0.5rem;
    text-align: center;
    border-radius: 5px;
}
header nav a{
    color: rgb(231, 255, 251);
    padding-left: 5rem;
    padding-right: 5rem;
}

header nav {
    background: rgb(124, 173, 182);
}
body{
    background:#7ad8c8;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    text-align: center;
    margin-left: 3rem;
    margin-right: 3rem;
}

.foto{
    margin-top: 1rem;
    border-radius: 50rem;
    border: 5px solid whitesmoke;
}

h1{
    color: white
}

h2{
    color: rgb(231, 255, 251);;
    border-radius: 5px;

}

h3.grupo{
    color: rgb(231, 255, 251);;
    border-radius: 5px;

}

h3 {
    text-align: center
}
/*ESTOS SON URLS*/
a:link, a:visited, a:active {
    text-decoration:none;
}

h2 a{
    color: rgb(231, 255, 251);
}

a:hover{
    color: rgb(159, 255, 239);
}

a:active{
    color: rgb(0, 0, 0);
}
footer p{
    color: rgb(0, 0, 0);
    font-size: 0.7rem;
}

p {
    text-align: center;
}

.links-int a{
    color: rgb(231, 255, 251);
}
.links-int a:link{
    color: rgb(231, 255, 251);
}
.links-int a:active{
    color: rgb(0, 0, 0)
}

.links-int a:hover{
    color: rgb(159, 255, 239);
}

.links-int {
    width: 60%; border-radius: 5rem; margin: 25px;
}

main {
    background-image: url(../img/fondo.png);
}
.materias {display: flex; justify-content: space-around;}
.columna{background: rgb(231, 255, 251, 0.850); width: 30%; border-radius: 5rem; margin: 25px; box-shadow:1px 1px 10px rgba(128, 128, 128, 0.295);}

.grupo {
    border-radius: 50rem;
    border: 2px solid whitesmoke;
    width: 15%;
    color:whitesmoke;
    text-align: center;
    box-shadow:1px 1px 10px rgba(128, 128, 128, 0.295);}

.nombre-fotos{
    display: flex;
        margin-top: 1rem;
        border-radius: 50rem;
        justify-content: space-between;
        align-items: center;
        align-content: stretch;
}