*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Helvetica, sans-serif;
}

body{
  background-color: #333;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3em;
}

#Cal{
  width: 400px;
  padding: 2em;
  background-color: #141413;
  color: rgb(199, 185, 242);
  border-radius: 0.5em;
  display: flex;
  flex-direction: column;
}
#Cal h3{
  background: rgb(225, 225, 225);
  width: 5.7em;
  text-align: center;
  border-radius: 3px;
  padding: 2px;
  font-size: 0.9em;
  font-weight: 300;
  color: rgb(11, 145, 242);
}

#operations{
  text-align: right;
  
}

#previous-operation, 
#current-operation{
  min-height: 1.6em;
  overflow-wrap: break-word;
  padding: 0.2em;
}

#previous-operation{
  color: rgb(171, 170, 223);
}

#current-operation{
  font-size: 3em;
  font-weight: 700;
}

#buttons-container{
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 3px;
}

#buttons-container button{
  border: 1px solid transparent;
  border-radius: 3rem;
  height: 4em;
  font-size: 1.2em;
  background-color: #2b2626;
  color: white;
  cursor: pointer;
}

#buttons-container .number{
  background-color: #f3f3f3;
  color: black;
}

#buttons-container button:hover {
  background-color: #bababa;
  color: black;
  border-color: #999;
}

#buttons-container #equal-btn{
  grid-column: span 2;
  background-color: #75a5cb;
}
#buttons-container #equal-btn:hover{
  background-color: #3a91d8;
}