html {
  position: relative;
}
.mask {
  position: absolute;
  display: none;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  margin: auto;
  width: 100%;
  height: 100%;
  z-index: 999;
  background: rgba(0, 0, 0, 0.6);
}
.mask .mask_content {
  position: absolute;
  top: 60px;
  left: 20%;
  width: 61%;
  height: 55%;
  padding: 16px;
  border: 16px solid #2192e2;
  background-color: #fff;
  z-index: 1002;
  overflow: auto;
  line-height: 24px;
  font-size: 14px;
}
.mask .mask_content input {
  border: 1px solid #2192e2;
  border-radius: 4px;
  padding: 5px;
}