.container-box {
    margin: 1 auto;
    width: 100%;
    height: 800px;
    position: absolute;
}
#st-box {
    float:left;
    width: 25%;
    height: 100%;
    top: 10px;
    left: 10px;

}
#nd-box {
    float:left;
    width:180px;
    height:160px;
    margin-left:20px;
}
#rd-box {
    float:left;
    width: 75%;
    height: 100%;
    top: 10px;
    right: 10px;

}


.button {
  background-color: #00FF00;
  border: none;
  color: white;
  padding: 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
}

.button1 {border-radius: 2px;}
.button2 {border-radius: 4px;}
.button3 {border-radius: 8px;}
.button4 {border-radius: 12px;}
.button5 {border-radius: 50%;}
.button6 {border-radius: 12px;   background-color:red}