stylesss.css

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
:root {
  font-family: "Roboto", sans-serif;
  --color: rgb(14, 15, 6);
  --color2: rgb(251, 249, 249);

}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  height: 100vh;
  color: rgb(6, 6, 6);
  font-size: 20px;

}
label {
  font-size: 40px;
  letter-spacing: 2px;
  font-weight: bold;
}
input {
  margin: 50px 0 10px;
  padding: 7px;
  font-size: 20px;
}
.result {
  margin: 10px 0 50px;
  font-size: 26px;
  color: rgb(8, 8, 8);
  letter-spacing: 1px;
  height: 1em;
  font-weight: bold;
}

button {
  width: 200px;
  margin: 0 30px;
  padding: 10px 30px;
  background: none;
  border: 2px solid var(--color);
  border-radius: 5px;
  color: var(--color2);
  font-size: 25px;
  transition: color 0.3s, box-shadow 0.3s;
  box-shadow: 3px 3px 10px var(--color);
  text-transform: uppercase;
  cursor: pointer;
}
button:hover {
  color: var(--color);
  box-shadow: 3px 3px 10px var(--color2);
}


/*  Media queries */
@media screen and (max-width: 500px){
  label{
    font-size: 35px;
  }
}
@media screen and (max-width: 1000px) {
  button {
    display: flex;
    margin-bottom: 20px;
    justify-content: center;
  }
}