html,
body {
  padding: 0;
  margin: 0;
  height: 100%;
}
body {
  box-sizing: border-box;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 40px;
  background-color: #f3f4f6;
}
.phone {
  position: relative;
  flex: 1;
  border-radius: 40px;
  padding: 10px;
  height: 500px;
  max-width: 250px;
  background-color: #fff;
  box-shadow: 10px 18px 10px #a1aab3, inset -3px -3px 5px 3px #d5d9dc;
}
.phone::before {
  content: "";
  position: absolute;
  left: 15px;
  right: 15px;
  top: 20px;
  bottom: 15px;
/*  background-color: #f0f4f3; */
  border-radius: 40px;
}
.phone::after {
  content: "";
  position: absolute;
  height: 25px;
  width: 50%;
  left: 50%;
  transform: translate(-50%, 0);
  background-color: #fff;
  border-radius: 40px;
}

iframe {
	border-radius: 40px;
	position: absolute;
    left: 15px;
	top: 10px;
}