* {
    padding: 0;
    margin: 0;
    box-sizing: content-box;
}

img {
    width: 3em;
    height: 3em;
}

.menu {
    margin: 0em 0.5em 0em 0em;
}

.perfil {
    border-radius: 50%;
    margin: 0.5em
}

body {
    display: flex;
    flex-direction: column;
    align-items: center
}

header {
    position: fixed;
    width: 100%;
    
}

header nav {
    display: flex;
    background-color: #0059b3;
}

header nav ul {
    display: flex;
    width: 100%;
    justify-content: space-between;
    align-items: center
}

header nav ul li {
    display: flex;
    justify-content: center
}

header nav ul li select {
    background-color: dimgrey;
    color: #0080ff;
    font-size: 1.3em;

}

header div {
    display: flex;
justify-content: center;
    margin: 0.5em
    
    
}

header div p {
    background-color: #99c2ff;
    border-radius: 30%;
    padding-left: 0.7em;
    padding-right: 0.5em;
    font-family: sans-serif;
    font-weight: bold
    
    
}

main {
    width: 100%;
    background-color: dimgrey
}

main section {
    display: flex;
    flex-direction: column;
    justify-content: center
}

main section div {
    display: flex;
    justify-content: center;
    padding: 2em;
    margin: 0.1em;
    background-color: #3399ff;
    font-size: 1.5em;
    font-family: sans-serif
}

.primermateria {
    padding: 7rem 3rem 3rem 3rem;
    -webkit-webkit-transition: width 0.3s ease-in-out;
}
.primermateria:hover {
    height: 5em;
    display: flex;
}
.expandible {
    -webkit-webkit-transition: width 0.3s ease-in-out;
    }
.expandible:hover {
    height: 5em;
    display: flex;
    
}

.expandible1 {
    -webkit-webkit-transition: width 0.3s ease-in-out;
    background-color: #b3b3b3
    }
.expandible1:hover {
    height: 5em;
    display: flex;
    
}
.expandible2 {
    -webkit-webkit-transition: width 0.3s ease-in-out;
    background-color: #006bb3
    }
.expandible2:hover {
    height: 5em;
    display: flex;
    
}