* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: sans-serif;
  outline: none;
}
/* Background full layar */
body {
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: Arial, sans-serif;

  background: url("image/laut.jpg") no-repeat center center fixed;
  background-size: cover; /* biar nutup full layar */
}
.container {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.calculator {
  background-color: #ecf0f3;
  padding: 20px;
  border-radius: 30px;
  display: grid;
  grid-template-columns: repeat(4, 68px);
  box-shadow: inset 5px 5px 12px #fff,
              inset 5px 5px 12px rgba(0,0,0,0.16);
}

input {
  width: 260px;
  height: 70px;
  grid-column: span 4;
  text-align: end;
  background: #ecf0f3;
  margin: auto;
  margin-top: 20px;
  margin-bottom: 20px;
  padding: 20px;
  border: none;
  border-radius: 30px;
  font-size: 50px;
  box-shadow: inset -5px -5px 12px #fff,
              inset 5px 5px 12px rgba(0,0,0,0.16);
  color: rgba(70,70,70);
}

button {
  width: 48px;
  height: 48px;
  margin: 8px;
  background: #ecf0f3;
  border-radius: 50%;
  box-shadow: -5px -5px 12px #fff,
               5px 5px 12px rgba(0,0,0,0.16);
  border: none;
  font-size: 16px;
}

.eval {
  width: 115px;
  background: #ecf0f3;
  box-shadow: -5px -5px 12px #fff,
               5px 5px 12px rgba(0,0,0,0.16);
  border: none;
  border-radius: 30px;
}