* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

body {
  height: 100vh;
  width: 100%;
}

header {
  width: 100%;

  padding: 1rem;

  color: rgb(255, 255, 255);
  font-size: 1.3rem;
  text-align: center;

  background: #168aad;
  background-image: linear-gradient(
    left,
    #34a0a4 20%,
    #168aad 40%,
    #1a759f 60%,
    #1e6091 80%,
    #184e77 100%
  );
  background-image: -webkit-linear-gradient(
    left,
    #34a0a4 20%,
    #168aad 40%,
    #1a759f 60%,
    #1e6091 80%,
    #184e77 100%
  );
  background-image: -moz-linear-gradient(
    left,
    #34a0a4 20%,
    #168aad 40%,
    #1a759f 60%,
    #1e6091 80%,
    #184e77 100%
  );
  background-size: 200% 200%;

  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.26);

  animation: run 3s infinite alternate;
}

#results,
#calculator {
  width: 40rem;
  max-width: 90%;

  margin: 2rem auto;
  padding: 2rem;

  color: #168aad;

  border: 1px solid #168aad;
  border-radius: 10px;

  box-shadow: 4px 2px 8px #168aad;
}

#results {
  text-align: center;
}

#calculator input {
  width: 10rem;

  padding: 0.15rem;
  margin: auto;

  display: block;

  color: #168aad;

  font: inherit;
  font-size: 3rem;
  text-align: center;

  border: 2px solid #168aad;
}

#calculator input:focus {
  outline: none;
}

#calculator button {
  padding: 1rem;
  margin: 0.25rem;

  background: #168aad;
  background-image: linear-gradient(
    left,
    #168aad 25%,
    #1a759f 50%,
    #1e6091 75%,
    #184e77 100%
  );
  background-image: -webkit-linear-gradient(
    left,
    #168aad 25%,
    #1a759f 50%,
    #1e6091 75%,
    #184e77 100%
  );
  background-image: -moz-linear-gradient(
    left,
    #168aad 25%,
    #1a759f 50%,
    #1e6091 75%,
    #184e77 100%
  );
  color: #fff;
  font: inherit;

  border: 1px solid #168aad;

  cursor: pointer;
}

#calculator button:focus {
  outline: none;
}

#calculator button:hover,
#calculator button:active {
  background: #184e77;
  background-image: linear-gradient(
    right,
    #168aad 25%,
    #1a759f 50%,
    #1e6091 75%,
    #184e77 100%
  );
  background-image: -webkit-linear-gradient(
    right,
    #168aad 25%,
    #1a759f 50%,
    #1e6091 75%,
    #184e77 100%
  );
  background-image: -moz-linear-gradient(
    right,
    #168aad 25%,
    #1a759f 50%,
    #1e6091 75%,
    #184e77 100%
  );
}

#calc-actions button {
  width: 4rem;
}

#calc-actions {
  margin-top: 1rem;
  text-align: center;
}

@keyframes run {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 100% 100%;
  }
}