* {
    box-sizing: border-box;
    flex-wrap: wrap;
}

body {
    font-family: 'Roboto', sans-serif;
    font-size: 16px;
    line-height: 1.5;
    margin: 0;
}

/* Estilos para el encabezado*/
header {
    background-color: black;
    color: lightsteelblue;
    justify-content: space-between;
    padding: 1em;
    font-family: 'IM Fell DW Pica', serif;
    z-index: 1;
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    box-sizing: border-box;
}

nav {
    text-align: right;
}

nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

nav li {
    display: inline-block;
    margin-left: 1em;
}

nav a {
    color: #fff;
    text-decoration: none;
}

nav a:hover {
    text-decoration: underline;
}

a:hover {
    color: black;
    background-color: lightsteelblue;
    border: 5px solid lightsteelblue;
    text-decoration: underline;
}

.icon {
    color: lightsteelblue;
    text-decoration: none;
    padding: 1px;
    font-size: xx-large;
}

.icon:hover {
    color: plum;
    background-color: black;
    text-decoration: none;
    padding: 0px;
    border: none;
}

.contacto {
    color: black;
    background-color: lightsteelblue;
    border: 5px solid lightsteelblue;
    text-decoration: underline;
}

/* Estilos para le main */
main {
    margin-top: 80px;
    padding: 20px;
    display: flex;
    flex-direction: row;
    justify-content: space-evenly;
    text-align: center;
    background: radial-gradient(white, plum, lightsteelblue, midnightblue);;
}

h1 {
    font-family: 'IM Fell DW Pica', serif;
    color: purple;
}

i {
    font-size: xx-large;
}

a {
    color: black;
}

a:hover {
    color: #fff;
}

.container_mail{
    padding: 100px;
    width: 50%;
    height: 507px;
}

/*redes*/
.container_redes {
    padding: 100px;
    width: 50%;
    height: 507px;
}

.redes {
    display: flex;
    flex-direction: row;
    justify-content: center;
}

.red {
    color: beige;
    background-color: violet;
    border: solid gray 2px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    text-decoration: none;
    font-size: x-large;
}

.red:hover {
    color: #fff;
    background-color: black;
    border: solid 1px black;
    text-decoration: none;
}

/* Estilos para el pie de página */
footer {
    display: flex;
    flex-direction: column;
    background-color: black;
    color: white;
    font-family: 'Times New Roman', Times, serif;
    font-size: small;
    padding: 5px 0px 5px 0px;
}

@media screen and (max-width:900px){
    main {
        flex-direction: column;
        justify-content: center;
    }
    .container_mail{
        padding: 10px;
        width: 100%;
    }
    .container_redes {
        padding: 10px;
        width: 100%;
    }
} 

@media screen and (max-width:400px){
    .container_mail{
        width: 200px;
    }
    .container_redes {
        width: 200px;
    }
}

@media screen and (max-width: 300px) {
    header {
        font-size: small;
        height: 100px;
    }
    h2 {
        margin: 0px;
        font-size: 20px;
    }
    .icon {
        font-size: large;
    }   
    .redes {
        margin: 0px;
    }
    .container_mail{
        font-size: small;
    }
}