clean up css

/* CUSTOMIZE THE NAVBAR

-------------------------------------------------- */

/* Special class on .container surrounding .navbar, used for positioning it into place. */

.navbar-wrapper {

  position: absolute;

  top: 0;

  right: 0;

  left: 0;

  z-index: 20;

  margin-top: 0px;

}

/* Flip around the padding for proper display in narrow viewports */

.navbar-wrapper > .container {

  padding-right: 0;

  padding-left: 0;

}

.navbar-wrapper .navbar {

  padding-right: 15px;

  padding-left: 15px;

}

.navbar-wrapper .navbar .container {

  width: auto;

  background-color: #fff;

  border-radius: 5px;

}

.banner{

  height: 300px;

}