.image_full {
    display: block;
    width: 100%;
    margin: auto;
    border: none!important;
    height: 33vw;
}

.image_mobile {
    display: none;
}

@media (max-width:640px) and (min-width:320px) {
    .image_full {
        display: none;
    }
    .image_mobile {
        display: block;
        height: 100vw;
    }
}

button.css3button {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 10px;
    color: #ffa400;
    padding: 5px;
    margin: 7px;
    margin-top: 10px;
    margin-left: 23px;
    min-width: 130px;
    background: -moz-linear-gradient(top, #ff002b 0%, #c73434 50%, #ffc800);
    background: -webkit-gradient(linear, left top, left bottom, from(#a40606), color-stop(0.50, #000000), to(#750909));
    -moz-border-radius: 10px;
    border-radius: 10px;
    border: 1px solid #ffffff;
    -moz-box-shadow: 0px 1px 3px rgba(255, 255, 255, 0.5), inset 0px 0px 5px rgba(214, 199, 98, 0.6);
    -webkit-box-shadow: 0px 1px 3px rgba(255, 255, 255, 0.5), inset 0px 0px 5px rgba(214, 199, 98, 0.6);
    box-shadow: 0px 1px 3px rgba(255, 255, 255, 0.5), inset 0px 0px 5px rgba(214, 199, 98, 0.6);
}

@media screen and (max-width: 768px) {
    header {
        padding: 0;
    }
    header {
        background-size: 100% 100%;
    }
    img {
        max-width: 100%;
        height: auto;
    }
}