* {
    box-sizing: border-box;
}

:root {
    --fondobody: black;
    --fondocaberas: #07417a;
    --fondocartas: #dbe7f6;
    --fondomain: white;
    background-color: var(--fondobody);

    font-family: Arial, Helvetica, sans-serif;
}

body {
    margin: 0px;
    padding: 0px;
    background-color: var(--fondomain);
    width: 1200px;
    margin: auto;
}

body>header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 130px 300px;
    grid-template-areas:
        'avion menu'
        'imagen imagen';

    background-color: var(--fondocaberas);
    color: var(--fondomain);
}

body>header>span {
    grid-area: avion;
    font-size: 110px;
    color: var(--fondocartas);
    display: grid;
    /* justify-content: center; */
    align-items: center;
    margin-left: 50px;
}

body>header>nav {
    grid-area: menu;
    display: grid;
    justify-content: end;
    align-items: center;
    margin-right: 40px;
}

body>header>nav>ul {
    margin: 0px;
    padding: 0px;
    list-style: none;
}

body>header>nav>ul li {
    display: inline;
}

body>header>nav>ul li a {
    color: var(--fondomain);
    text-decoration: none;
    display: inline-block;
    margin: 15px;
    text-transform: uppercase;
}

body>header>div {
    grid-area: imagen;
}

body>header>div>img {
    height: 100%;
    width: 100%;
    object-fit: cover;
}

body main {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    grid-gap: 15px;
    padding-left: 40px;
    padding-right: 40px;
    padding-top: 15px;
    padding-bottom: 15px;
}


footer {
    background-color: var(--fondocaberas);
    color: var(--fondomain);
    display: grid;
    height: 100px;
    justify-content: center;
    align-items: center;
}

.caja50 {
    grid-column: span 6;
    background-color: var(--fondocartas);
    padding: 20px;
}

.caja33 {
    grid-column: span 4;
    background-color: var(--fondocartas);
    padding: 35px;
    font-size: 0.8em;
    line-height: 1.4em;
    text-align: justify;
}

.caja33 img, .caja50 img {
    height: 170px;
    width: 100%;
    object-fit: cover;
    border-radius: 20px;
}

.boton {
    color: var(--fondomain);
    background-color: var(--fondocaberas);
    display: block;
    padding: 10px;
    text-align: center;
    border-radius: 4px;
    text-decoration: none;
    max-width: 37%;
}


/* tablets */
@media screen and (min-width: 450px) and (max-width: 1200px)  {
    body {
        width: 100%;
    }

    body>header {
        grid-template-columns: 1fr 3fr;
    }

    body>header>nav>ul li a {
        font-size: 1.2em;
        margin: 6px;

    }

    body main {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        grid-gap: 15px;
        padding-left: 15px;
        padding-right: 15px;
        padding-top: 15px;
        padding-bottom: 15px;
    }

    .caja50 {
        grid-column: span 2;
        padding: 15px;
        font-size: 1.3em;
    }

    .caja33 {
        grid-column: span 1;
        padding: 15px;
        font-size: 1.2em;
    }

}