:root {
    --background: #f6f6f6;
    --font: #222;
    --border: #333;
    --screen: #eee;
    --calculator: #aaa;
    --btn: #eee;
    --btn-hover: #ddd;
    --btn-active: #ccc;
    --btn-red: #faa;
    --btn-red-hover: #e99;
    --btn-red-active: #d88;
    --btn-blue: #aaf;
    --btn-blue-hover: #99e;
    --btn-blue-active: #88d;
  }

.main {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 75vh;
    min-height: 500px;
    padding: 10px;
    margin-top: 50px;
  }

.calculator {
    width: 400px;
    height: 600px;
    background-color: gray;
    margin-top: 100px;
    border-radius: 15px;
    border: 2px solid black;
}

.screen {
    width: 350px;
    height: 150px;
    background-color: bisque;
    margin-left: auto;
    margin-right: auto;
    margin-top: 25px;
    margin-bottom: 25px;
    border-radius: 15px;
    text-align: right;
    border: 2px solid #222;
}

.scrncon {
    padding-right: 15px;
    padding-top: 20px;
}

#result {
    font-size: 24px;
}


.buttons-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 10px;
    padding: 10px;
  }
  
  .span-2 {
    grid-column: span 2;
  }

/* Buttons */

.btn, .btnOp, .btneq, .btnclr {
    padding: 20px;
    border: 2px var(--border) solid;
    border-radius: 5px;
    background-color: var(--btn);
    font-size: 20px;
  }
  
  
  .btn:hover,.btnOp:hover, .btneq:hover {
    background-color: var(--btn-hover);
  }
  
  .btn:active, .btnOp:active, .btneq:active {
    background-color: var(--btn-active);
  }
  
  .btn-red {
    background-color: var(--btn-red);
  }
  
  .btn-red:hover {
    background-color: var(--btn-red-hover);
  }
  
  .btn-red:active {
    background-color: var(--btn-red-active);
  }
  
  .btn-blue {
    background-color: var(--btn-blue);
  }
  
  .btn-blue:hover {
    background-color: var(--btn-blue-hover);
  }
  
  .btn-blue:active {
    background-color: var(--btn-blue-active);
  }

  .git {
    margin-top: 100px;
    margin-left: auto;
    margin-right: auto;
  }