aside .sumario {
    margin-top: 20px;
}
#materia {
    position: absolute;
    left: 50%;
    top: 60px;
    border: solid 1px #ccc;
    box-shadow: 2px 2px 4px rgba(120, 120, 120, .4);
    overflow: hidden;
}
#materia iframe {
    max-width: 100%;
    max-height: 100%;
}
.html {
    position: relative;
}
.help1 {
    position: absolute;
    top: 0;
    right: 120px;
    background: url(/img/arrow-up.png) center right no-repeat transparent;
    text-shadow: 0px 0px 3px rgba(0, 0, 0, .4);
    padding: 60px 100px 20px 20px;
    font-size: 18px;
    width: 300px;
    z-index: 999;
    border: none;
}
.help2 {
    position: absolute;
    top: 60px;
    left: 260px;
    background: url(/img/arrow-left.png) center left no-repeat transparent;
    text-shadow: 0px 0px 3px rgba(0, 0, 0, .4);
    padding: 60px 20px 20px 120px;
    font-size: 18px;
    width: 320px;
    z-index: 999;
    border: none;
}
@media screen and (max-width: 1024px) {
    .help1 {
        width: 250px;
        background: url(/img/arrow-left.png) center left no-repeat transparent;
        padding: 60px 20px 20px 120px;
        top: -70px;
        right: 0;
    }
}
@media screen and (max-width: 700px) {
    .help1 {
        width: 234px;
        background: url(/img/arrow-up.png) center right no-repeat transparent;
        padding: 60px 100px 20px 20px;
        top: 0px;
        right: 0;
    }
    .help2 {
        top: 100px;
        left: 50px;
        background: url(/img/arrow-up-2.png) center left no-repeat transparent;
    }
    .navbar-fixed-bottom {
        position: fixed;
        bottom: 0;
        z-index: 998;
    }
}