.box {
  position: relative;
  margin: 0 auto 20px;
  padding: 20px 0 20px;
  /* max-width: 840px; */
  text-align: center;
  background: #fff;
}

.box:after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 4px;
  -webkit-border-radius: 50%;
          border-radius: 50%;
  -webkit-box-shadow: 0 0 10px rgba(0, 0, 0, 0.4);
     -moz-box-shadow: 0 0 10px rgba(0, 0, 0, 0.4);
          box-shadow: 0 0 10px rgba(0, 0, 0, 0.4);
  z-index: -1;
}