body {
  margin: 0px;

  padding: 0px;
  display: flex;
  /* flex-direction:row */
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: rgb(33, 184, 225);
}
h1 {
  text-align: center;
  font-weight: bold;
  /* border: 4px solid black; */
  /* text-shadow: -4px 0 black, 0 4px black, 4px 0 black, 0 -4px black; */
  -webkit-text-stroke: 2px black; /* width and color */
  font-size: 7rem;
  font-family: fantasy;
  color: rgb(190, 4, 4);
  width: 52%;
  margin-left: -89px;
}
.calculator {
  font-family: "Franklin Gothic Medium", "Arial Narrow", Arial, sans-serif;
  background-color: rgb(212, 205, 205);
  max-width: 500px;
  overflow: hidden;
  border-radius: 25px;
}
#display {
  width: 100%;
  padding: 20px;
  padding-left: 0px;
  font-size: 3rem;
  color: rgb(104, 104, 104);
  background-color: rgb(255, 255, 255);
  border: none;
  text-align: right;
}
.keys {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  padding: 25px;
}
button {
  width: 50px;
  height: 50px;
  border-radius: 50px;
  border: none;
  color: rgb(255, 255, 255);
  background-color: rgb(33, 184, 225);
  font-size: 2rem;
  font-weight: bold;
  cursor: pointer;
  position: relative;
  left: 28%;
  font-weight: bold;
  /* padding: 2rem;
    margin: 1rem; */
}
button:hover {
  background-color: rgb(20, 120, 147);
}

button:active {
  border-radius: 15px;
}
.op-button {
  background-color: rgb(190, 4, 4);
}
.op-button:hover {
  background-color: rgb(105, 6, 6);
}
#clear {
  background-color: rgb(77, 105, 115);
  border-radius: 0px;
  width: 72px;
  margin-left: -11px;
}
#clear:hover{
    background-color: rgb(65, 88, 96);
}
#backspace {
  font-size: 1.3rem;
}