html,
body {
  height: 100%;
  background-color: #f7f2ed;
}
.mask {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(0, 0, 0, 0.75);
  width: 100%;
  max-width: 750px;
  height: 100%;
  min-height: 13.34rem;
  display: none;
  z-index: 4;
}
.main {
  max-width: 750px;
  margin: 0 auto;
  height: 13.34rem;
}
input:-webkit-autofill {
  box-shadow: 0 0 0px 1000px white inset !important;
}