* {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    padding: 0px;
    margin: 0px;
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    background-color: #426783;
}

    body > div {
        position: fixed;
        background-repeat: no-repeat;
        background-position: center center;
        background-size: auto 100%;
        background-image: url('img/portada.jpg');
        background-position: center center;
        width: 100%;
        height: 100%;
    }

.icon-menu {
    display:none;
}

#marcoTexto {
    background-color:rgba(0,0,0,0.6);
    padding:25px;
    display: inline-block;
    border-top: 1px solid red;
    border-bottom: 1px solid red;
    width: 100%;
    height: calc(100% - 120px);
    color:white;
    overflow:auto;
}