h1,h2{
 text-align: center;
}
button {
  background-color: purple; /* Green */
  border: none;
  color: white;
  height: 100px;
  width: 32.93%;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin:2px;
  cursor:pointer;
  
}
div{
 text-align: center;
}
a:link {
  color: blue;
  text-decoration: none;
}

a:hover {
  color: gray;
  text-decoration: none;
}

a:active {
  color: gray;
  text-decoration: none;
}
input[type=text]{
width:250px;
height:30px;
border: 2px solid black;
border-radius:4px;
font-size:30px;
}
table, th, td {
 width:30%;
 border: 1px solid black;
 border-collapse: collapse;
 text-align: left;
 margin-left: auto;
 margin-right: auto;
}
h3{
 position: relative;
 text-align: center;
}
input[type="radio"] {
  display: none;
}
input[type="radio"] + *::before {
  content: "";
  display: inline-block;
  vertical-align: bottom;
  width: 1rem;
  height: 1rem;
  margin-right: 0.3rem;
  border-radius: 50%;
  border-style: solid;
  border-width: 0.15rem;
  border-color: #000000;
}
input[type="radio"]:checked + *::before {
  background: radial-gradient(green 0%, green 40%, transparent 50%, transparent);
  border-color: green;
}
label > input[type="radio"]:checked + * {
  color: teal;
}