* {
  margin: 0%;
  padding: 0%;
  box-sizing: border-box;
}
body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: black;
  color: white;
}
/* Utility css */
h1 {
  font-size: 50px;
  margin-top: 20px;
  margin-bottom: 40px;
  align-items: center;
  text-align: center;
  color: yellow;
}
h1:hover {
  color: rgb(0, 255, 0);
}
h2 {
  font-size: 20px;
  margin-top: 20px;
  margin-bottom: 40px;
  align-items: center;
  text-align: center;
  font-family: sans-serif;
}

h5 {
  font-size: 15px;
  margin-top: 20px;
  margin-bottom: 20px;
  align-items: center;
  text-align: center;
  color: yellow;
}
h5:hover {
  color: rgb(0, 255, 0);
}
nav {
  justify-content: space-around;
  align-items: center;
  min-height: 8vh;
}
.links {
  justify-content: space-around;
  display: flex;
}
.links li {
  list-style: none;
  display: contents;
}
.links a {
  text-decoration: none;
  color: white;
  padding: 5px;
}
.links a:hover {
  color: yellow;
}
.cal {
  align-items: center;
  justify-content: center;
  display: flex;
  flex-direction: column;
}
#A {
  border-radius: 15px;
  border-style: none;
  padding: 5px;
}
#B {
  border-radius: 15px;
  border-style: none;
  padding: 5px;
}
#result {
  border-radius: 15px;
  border-style: none;
  padding: 5px;
}
.btn {
  border-radius: 5px;
  padding: 5px;
  text-align: center;
  border-style: none;
  background-color: yellow;
  margin-left: -35px;
}
.btn:hover {
  background-color: chartreuse;
}
@media screen and (max-width: 640px) {
  .links {
    font-size: 13px;
  }
  h1{
    font-size: 30px;
}
}

p {
  text-align: center;
  margin-top: 80px;
}
.pfp {
  text-decoration: none;
  color: rgb(0, 255, 0);
}