直接上效果：

核心代码如下：

.map-interview {
    background-image:-webkit-linear-gradient(
    to right, 
    rgba(0,0,0,0) 0%, 
    rgba(0,0,0,0.4) 5%, 
    rgba(0,0,0,0.6) 10%, 
    rgba(0,0,0,0.6) 90%, 
    rgba(0,0,0,0.4) 95%, 
    rgba(0,0,0,0) 100%);
  background-image: linear-gradient(
    to right, 
    rgba(0,0,0,0) 0%, 
    rgba(0,0,0,0.4) 5%, 
    rgba(0,0,0,0.6) 10%, 
    rgba(0,0,0,0.6) 90%, 
    rgba(0,0,0,0.4) 95%, 
    rgba(0,0,0,0) 100%);
  height: 220px;
  left: 50%;
  margin-left: -350px;
  margin-top: -110px;
  padding: 10px 0px 10px 30px; 
  position: absolute;
  top: 30%;
  width: 700px;
  border: 1px solid rgba(0, 0, 0, 0.1);
}

Best Wishes For You!