.teachers_banner { width: 1300px; height: 752px; background-size: cover; position: relative; overflow: hidden; }
.teachers_b { position: relative; margin-top: 80px; }
#slide { margin: 0px auto; width: 752px; height: 600px; position: relative; }
#slide li { position: absolute; width: 760px; display: flex; align-items: flex-start; background: rgb(255, 255, 255); overflow: hidden; box-shadow: rgb(29, 55, 77) 0px 0px 20px; }
#slide li img { width: 100%; height: 100%; }
.arrow { }
.arrow .prev, .arrow .next { position: absolute; width: 64px; top: 38%; z-index: 9; font: 700 96px simsun; opacity: 0.3; color: rgb(255, 255, 255); cursor: pointer; }
.arrow .prev { left: -220px; }
.arrow .next { right: -220px; }
.arrow .prev:hover, .arrow .next:hover { color: rgb(0, 160, 233); opacity: 0.7; }
body { margin: 0px; }