html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  background-color: silver;
  color: black;
}

#box {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 640px;
  margin-left: -320px;
  height: 480px;
  margin-top: -240px;
  overflow: auto;
  border-top: 2px solid #808080;
  border-left: 2px solid #808080;
  border-bottom: 2px solid #d3d3d3;
  border-right: 2px solid #d3d3d3;
  background-color: white;
  color: black;
}
 
#boxin {
  position: absolute;
  top: 64%;
  left: 50%;
  width: 150px;
  height: 60px;
  margin-left: -75px;
  margin-top: -30px;
  background-color: white;
}

#boxin2 {
  position: absolute;
  top: 29%;
  left: 50%;
  width: 150px;
  height: 150px;
  margin-left: -75px;
  margin-top: -75px;
  background-color: white;
}

#boxin3 {
  position: absolute;
  top: 85%;
  left: 50%;
  width: 77px;
  height: 16px;
  margin-left: -38px;
  margin-top: -8px;
  background-color: white;
}