@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@300&display=swap');

body {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  background: #8e0e00;
  font-family: 'Open Sans', sans-serif;
}
h1 {
  font-size: 1.125rem;
  margin-left: 20%;
}
#container {
  display: flex;
  align-items: stretch;
  flex-direction: column;
  background: #f7f7f7;
  height: 35.813rem;
  width: 22.5rem;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 1.25rem;
}
#header {
  background: #1f030c;
  color: white;
  border-top-left-radius: 1.25rem;
  border-top-right-radius: 1.25rem;
}
#form {
  font-size: 1rem;
  padding: 1.5rem;
}
#amount {
  width: 70%;
  padding: 0.3rem 0.5rem;
  border: 2px inset rgba(28, 110, 164, 0.36);
}
#amount:focus {
  outline: none;
  border: 3px solid #2980b9;
}
#service {
  width: 90%;
  padding: 0.813rem;
  border: 2px inset rgba(28, 110, 164, 0.36);
  font-size: 1.563rem;
  /* background: #56556e; */
}
#service option {
  background: #56556e;
  color: white;
}
#numOfPeople {
  width: 80%;
  padding: 0.4rem 0.6rem;
  border: 2px inset rgba(28, 110, 164, 0.36);
}
#btn {
  font-size: 1.2rem;
  font-weight: bold;
  background: #ad133a;
  color: white;
  border-radius: 0.3rem;
  width: 12.5rem;
  height: 3.125rem;
  margin: 1.875rem 1.875rem 0 1.875rem;
}
#btn:hover {
  background: #6e6d6d;
}
#totalTip {
  position: absolute;
  bottom: 10px;
  left: 35%;
  font-size: 1rem;
  text-align: center;
}