.blue-rectangle {
    color:white;
    font-size:15px;
    padding: 10px 20px 10px 200px;
    background-color: rgba(3,78,136,0.7);
    width: 200px;
    position: relative;
    margin-left: 350px;
}
.blue-rectangle:before {
    content: "";
    position: absolute;
    border: 10px solid transparent;
    border-top-color: rgba(3,78,136,0.7);
    border-right-color: rgba(3,78,136,0.7);
    right: 100%;
    top: 0;
    width: 0;
    height: 0
}

.reveal pre {

    width: 120%;
}
.reveal section img {
    background: rgba(255, 255, 255, 1);
}