body {
  padding-top: 50px;
  min-height: 800px;
}
.section-head {
  margin-bottom: 15px;  
}
.section-head a:hover, .section a:hover {
  text-decoration: none;
}

#footer {
   position:fixed;
   left:0px;
   bottom:0px;
   height:30px;
   width:100%;
   text-align: center;   
}

.content_img {
  margin-right: 5px;
}

@media (max-width: 767px) { 
  .not-xs { display: none; }
}

@media (min-width: 768px) and (max-width: 991px) {
  .not-sm { display: none; }
}

@media (min-width: 992px) and (max-width: 1199px) {
  .not-md { display: none; }
}

@media (min-width: 1200px) {
  .not-lg { display: none; }
}