#slider {
  position: relative;
  overflow: hidden;
  margin: 20px auto 0 auto;
  border-radius: 4px;
  float:left;
  border: 10px solid #fff;
  margin: 20px 0 20px 20px;
}

#slider ul {
  position: relative;
  margin: 0;
  padding: 0;
  height: 200px;
  list-style: none;
}

#slider ul li {
  position: relative;
  display: block;
  float: left;
  margin: 0;
  padding: 0;
  width: 400px;
  height: 400px;

  background: #ccc;
  text-align: center;
  line-height: 300px;
}

a.control_prev, a.control_next {
  position: absolute;
  top: 45%;
  z-index: 75;
  display: block;
  padding: 4% 3%;
  width: auto;
  height: auto;
  background: #2a2a2a;
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 18px;
  opacity: 0.8;
  cursor: pointer;
}

a.control_prev:hover, a.control_next:hover {
  opacity: 1;
  -webkit-transition: all 0.2s ease;
}

a.control_prev {
  border-radius: 0 2px 2px 0;
}

a.control_next {
  right: 0;
  border-radius: 2px 0 0 2px;
}

.slider_option {
  position: relative;
  margin: 10px auto;
  width: 160px;
  font-size: 18px;
}

@media screen and (max-width: 780px) {
	#slider {
	  position: relative;
	  overflow: hidden;
	  margin: 20px auto 0 auto;
	  border-radius: 4px;
	  float:left;
	  border: 0px solid #fff;
	  margin: 0;
	  width: 100%;
	}
 
 
	#slider ul li {
	  position: relative;
	  display: block;
	  float: left;
	  margin: 0;
	  padding: 0;
	  width: 100%;
	  height: 250px;

	  background: #ccc;
	  text-align: center;
	  line-height: 300px;
	}
	
	a.control_prev, a.control_next {
	  position: absolute;
	  top: 45%;
	  z-index: 75;
	  display: block;
	  padding: 4% 6%;
	  width: auto;
	  height: auto;
	  background: #2a2a2a;
	  color: #fff;
	  text-decoration: none;
	  font-weight: 600;
	  font-size: 18px;
	  opacity: 0.7;
	  cursor: pointer;
	}
}