style.css

body {
      background-color:black;
      color: white;
    }
.header{
  color:grey;
  font-size: 80px;
  font-family: Verdana, sans-serif;

 }
.maindiv{
  background-color: white;
  color: black;
  width: 90%;
  height: 610px;
  margin-left: auto;
  margin-right: auto;
  border-radius: 40px;
  font-family: Arial, sans-serif;
  line-height: 0.8 ;

  text-align: center;
}
table{
  margin-left: auto;
  margin-right: auto;
  width: 60%;
  font-size: 35px;

}
td{

  text-align: left;
  height: 65px;
  font-weight: bold;
}
.tdcenter{

  text-align: left;
}
.textbox{
  width: 390px;
  height: 30px;
  font-size: 20px;
  font-weight: bold;
}
.slider{
  width: 306px;
  height: 30px;
}
.slidernum{
  font-size: 22px;
  font-weight: bold;
}
select{
  height: 35px;
  width: 50px;
  font-size: 20px;
  font-weight: bold;
}
button{
  width: 230px;
  font-size: 25px;
  font-weight: bold;
}
.result_s{
  font-size: 23px;
  line-height: 1.1 ;

}
footer{
  text-align: left;
  margin-left: 30px;
  font-weight: bold;
  position:fixed;
  bottom:80px;
}