.course-title {
    font-size: 50px;
}
.site-title {
    padding-right: 45px;
}
.course-nav {
    float: left;
}
.mx-auto{
    margin: 0 20% 0;
}
@media (max-width: 550px) {
   .big-container {
       display: none;
   }
}
@media (min-width: 550px) {
   .small-container {
       display: none;
   }
}
.big-container{
    width: 150%;
   height: 250px;
}
.small-container{
    height: 700px;
}
/* Responsive iFrame */
.responsive-iframe-container {
   position: relative;
   padding-bottom: 56.25%;
   padding-top: 30px;
   overflow: hidden;
}
.responsive-iframe-container iframe,
.responsive-iframe-container object,
.responsive-iframe-container embed {
   position: absolute;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
}