style.css

/* Page Sections */
body {
  background-color: #F1F1F1;
  background-image: url('http://i.imgur.com/57EjZOf.png'); 
}
.container {
  width: 90%;
}

#content {
  border-bottom-right-radius: 4px;
  border-bottom-left-radius: 4px;
  background-color: #FCFCFC;
  margin-top: -20px;
  padding: 15px;
  display: none;
}

#error {
  display: none;
  font-size: 20px;
}




/* Select Bootstrap Styles */
a {
  color: #428BCA;
  text-decoration: none;
}
a:hover, a:focus {
  color: #2A6496;
  text-decoration: underline;
}

/* Alerts */
.alert {
  padding: 15px;
  border: 1px solid rgba(0, 0, 0, 0);
  border-radius: 4px;
  width: 100%;
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}
.alert-danger {
  color: #A94442;
  background-color: #F2DEDE;
  border-color: #EBCCD1;
}

/* Button */
.btn {
  display: inline-block;
  padding: 6px 12px;
  margin-bottom: 0;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.42857143;
  text-align: center;
  text-decoration: none;
  vertical-align: middle;
  cursor: pointer;
  background-image: none;
  border: 1px solid rgba(0, 0, 0, 0);
  border-radius: 4px;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}
.btn-primary {
  color: #FFF;
  background-color: #428BCA;
  border-color: #357EBD;
}
.btn-primary:hover, 
.btn-primary:focus, 
.btn-primary:active {
  color: #FFF;
  background-color: #3071A9;
  border-color: #285E8E;
  text-decoration: none;
}
.btn-hero {
  padding: 15px;
  font-size: 30px;
  width: 100%;
}


/* Utilities */
.center-block {
  display: block;
  margin-left: auto;
  margin-right: auto;
}
.text-center {
  text-align: center;
}
.flat-top {
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}
.flat-bottom {
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}