#header {
  display: block;
}
#header .navbar-fixed {
  position: fixed;
  left: 0;
  top: 0;
  right: 0;
  z-index: 99;
}
#footer {
  display: block;
}
#content {
  display: block;
  max-width: 1400px;
  margin: 0 auto;
}
.present-block {
  position: relative;
  overflow: hidden;
  padding: 0;
}
@media only screen and (max-width: 320px) {
  .present-block {
    min-width: 320px;
  }
}
.present-block .background {
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  display: block;
  z-index: 1;
  position: absolute;
  top: 0;
  left: 0;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -o-transition: all 0.5s;
  -ms-transition: all 0.5s;
  transition: all 0.5s;
}
.present-block .text {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background-color: rgba(0,0,0,0.5);
  z-index: 2;
  -webkit-transition: all 0.2s;
  -moz-transition: all 0.2s;
  -o-transition: all 0.2s;
  -ms-transition: all 0.2s;
  transition: all 0.2s;
  color: #fff;
  text-align: center;
  padding: 1em;
}
.present-block:hover .background {
  -webkit-transform: scale(1.02);
  -moz-transform: scale(1.02);
  -o-transform: scale(1.02);
  -ms-transform: scale(1.02);
  transform: scale(1.02);
}
.present-block:hover .text {
  background-color: rgba(0,0,0,0.9);
}