전체화면 배경이미지 깔기.

선택자 {

  position: absolute;

  top: 0;

  left: 0;

  width: 100%;

  height: 100%;

  background-image: url('이미지경로');

  background-repeat: no-repeat;

  background-position: center 0px;

  background-size: cover;

  -webkit-background-size: cover;

  overflow: hidden;

  pointer-events: none;

}