calculator.css

body {
  margin: 14%;
  margin-top: 40px;
  font-family: "Trebuchet MS", Helvetica, sans-serif;
}

@media screen and (max-width: 900px) {
  body {
    margin: 5%;
  }
}

header > h1 {
  font-family: "Trebuchet MS", Helvetica, sans-serif;
  font-size: 3em;
  color: grey;
}

.calc-container {
  display: flex;
  width: 100%;
  flex-direction: row;
  background-color: rgb(211,211,211);
  color: black;
  font-size: 1.4em;
}

@media screen and (max-width: 600px) {
  .calc-container {
    font-size: .9em;
  }
  input {
    font-size: .9em;
    padding: 1px;
  }
}

.calc-container > form {
  display: flex;
  flex-direction: column;
  border: 2px solid darkgrey;
  flex: 1;
  padding: 10px;
}

.calc-container > form > label {
  padding: 10px;
  padding-left: 0px;
  font-size: 1.3em;
}

button {
  font-size: 2em;
  -webkit-border-radius: 30px;
  -moz-border-radius: 30px;
  border-radius: 30px;
  background-color: rgb(150,150,150);
  color: white;
  max-width: 300px;
  min-width: 230px;
  border: 3px solid black
}

input {
  -webkit-border-radius: 30px;
  -moz-border-radius: 30px;
  border-radius: 30px;
  padding: 3px;
  padding-left: 10px;
  font-size: 1.3em;
}

.calc-container > div {
  flex: 1;
  border: 2px solid darkgrey;
  padding-left: 5px;
}

.calc-container h3 {
  font-size: 1.5em;
}

#calc-submit {
  width: 60px;
  align-self: center;
}