@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap');

*{
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Roboto' sans-serif;
  font-weight: bold;
}

a{
  text-decoration: none;
}

body{
  background: linear-gradient(to left, #073878, #630b9e, #3a04b8de, #0364f6de );
}

.grid_container{
  display: grid;
  justify-content: center;  
  align-content: center;
  min-height: 100vh;
  grid-template-columns: repeat(4, 6rem);
  grid-template-rows: minmax(6rem, auto) repeat(5, 5.7rem);
  margin-bottom: 5rem;
}

.grid_container > button{
  cursor: pointer;
  font-size: 2.5rem;
  border: none;
  outline: none;
  background-color: #111;
  color: #eee;
}

.grid_container button:hover{
  background-color: #eee;
  color: #111;
}

.grid_container  .operator{
  background: #03ffeade;
}

.grid_container .operator_result{
  background: rgb(3, 87, 197);
}

.span-two{
  grid-column: span 2;
}

.grid_container > .output{
  grid-column: 1 / -1;
  background: #222; 
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: space-around;
  padding: 10px;
  word-wrap:break-word;
  word-break: break-all;
}

.grid_container .output .previous-operand{
  color: rgb(255, 255, 255, .75);
  font-size: 1.5rem;
}

.grid_container .output .current-operand{
  color: white;
  font-size: 2.5rem;
}

::-webkit-scrollbar {
  width: 0.6rem;
  background-color: rgb(0, 0, 0);
}

::-webkit-scrollbar-thumb {
  background-color: rgb(255, 255, 255);
  border-radius: 0.5rem;
}