.app-container {
    width: 90%;
    max-width: 1170px;
    margin-left: auto;
    margin-right: auto;
}

.app-container h1 {
    margin-top: 0;
}

.app-container .img-holder {
    margin: 40px;
}

.app-container img {
    width: 100%;
}

.app-container .img-holder img {
    max-width: 100%;
    width: auto;
    margin-left: auto;
    margin-right: auto;
    display: block;
    box-shadow: 0px 2px 5px 0px rgba(0,0,0,0.75);
}