.smartphone {
  position: relative;
  width: 360px;
  height: 640px;
  margin: auto;
  border: 16px black solid;
  border-top-width: 60px;
  border-bottom-width: 60px;
  border-radius: 36px;
}

/* The horizontal line on the top of the device */
.smartphone:before {
  content: '';
  display: block;
  width: 60px;
  height: 5px;
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #333;
  border-radius: 10px;
}

/* The circle on the bottom of the device */
.smartphone:after {
  content: '';
  display: block;
  width: 35px;
  height: 35px;
  position: absolute;
  left: 50%;
  bottom: -65px;
  transform: translate(-50%, -50%);
  background: #333;
  border-radius: 50%;
}

/* The screen (or content) of the device */
.smartphone .content {
  width: 360px;
  height: 640px;
  background: white;
}

/* The device with borders */
.tablet {
  position: relative;
  width: 768px;
  height: 1024px;
  margin: auto;
  border: 16px black solid;
  border-top-width: 60px;
  border-bottom-width: 60px;
  border-radius: 36px;
}

/* The horizontal line on the top of the device */
.tablet:before {
  content: '';
  display: block;
  width: 60px;
  height: 5px;
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #333;
  border-radius: 10px;
}

/* The circle on the bottom of the device */
.tablet:after {
  content: '';
  display: block;
  width: 35px;
  height: 35px;
  position: absolute;
  left: 50%;
  bottom: -65px;
  transform: translate(-50%, -50%);
  background: #333;
  border-radius: 50%;
}

/* The screen (or content) of the device */
.tablet .content {
  width: 768px;
  height: 1024px;
  background: white;
  margin: -1px;
}

/* The laptop with borders */
.laptop {
  -webkit-transform-origin: 0 0;
  transform-origin: 0 0;
  -webkit-transform: scale(.6) translate(-50%); /* Scaled down for a better Try-it experience (change to 1 for full scale) */
  transform: scale(.6) translate(-50%); /* Scaled down for a better Try-it experience (change to 1 for full scale) */
  left: 50%;
  position: absolute;
  width: 1366px;
  height: 800px;
  border-radius: 6px;
  border-style: solid;
  border-color: black;
  border-width: 24px 24px 80px;
  background-color: black;

}

/* The keyboard of the laptop */
.laptop:after {
  content: '';
  display: block;
  position: absolute;
  width: 1600px;
  height: 60px;
  margin: 80px 0 0 -110px;
  background: black;
  border-radius: 6px;
}

/* The top of the keyboard */
.laptop:before {
  content: '';
  display: block;
  position: absolute;
  width: 250px;
  height: 30px;
  bottom: -110px;
  left: 50%;
  -webkit-transform: translate(-50%);
  transform: translate(-50%);
  background: #f1f1f1;
  border-bottom-left-radius: 5px;
  border-bottom-right-radius: 5px;
  z-index: 1;
}

/* The screen (or content) of the device */
.laptop .content {
  width: 1366px;
  height: 800px;
  overflow: hidden;
  border: none;
}