html {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(to right, #c31432, #240b36);
}

.calculator {
  background: white;
  width: 400px;
  border-radius: 12px;
  box-shadow: 0 5px 30px -5px #0f2027;
  box-shadow: -1px 0px 4px 1px rgb(0 0 0 / 69%) inset;
}

.display-calc {
  background: black;
  color: white;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  border-radius: 10px 10px 0px 0px;
}

.display-calc h1 {
  margin: 0;
  padding: 25px;
  font-size: 45px;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
    "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
  font-weight: 100;
  overflow-x: auto;
}

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: whitesmoke;
}

::-webkit-scrollbar-thumb {
  background: #888;
}

::-webkit-scrollbar-thumb:hover {
  background: #555;
}

.calc-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 10px;
  padding: 10px;
}

.eqlSign {
  grid-column: -2;
  grid-row: 2 / span 4;
  color: white;
}
#eql {
  background-color: #459bd7;
}

.operator {
  background-color: grey;
  color: white;
}

.clearBtn {
  background-color: #c31432;
  color: white;
}

button {
  border: 0px;
  border-radius: 12px;
  font-size: 18px;
  font-weight: 400;
  padding: 20px;
  transition: 200ms;
  filter: drop-shadow(1px 1px 1px black);
  box-shadow: -1px 0px 4px 1px rgb(0 0 0 / 69%) inset;
}

button:active {
  filter: drop-shadow(0px 0px 0px black);
}