/* The device with borders */
.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;
}