body {
    padding: 0;
    margin: 0;
    background: linear-gradient(to left, #ffa600, #a80000);
  }
  
  h1 {
    color: white;
    text-align: center;
    font-family: 'Segoe UI', sans-serif;
    font-style: bolder;
    font-size: 40px;
  }
  
  button {
    display: inline-block;
    font-size: 2rem;
    cursor: pointer;
    border: 1px solid rgb(0, 0, 0);
    outline: none;
    background-color: rgb(255, 115, 0);
    border-radius: 5px;
  }
  
  button:hover {
    background-color: #ff5100;
  }
  
  button:active {
    background-color: #ff5100;
    transform: translateY(5px);
  }
  
  .calcbtn {
    display: grid;
    justify-content: center;
    align-content: center;
    grid-template-columns: repeat(4, 100px);
    grid-template-rows: minmax(120px, auto) repeat(5, 100px); 
  }
  
  .larger {
    grid-column: span 2;
  }
  
  .outp {
    grid-column: 1 / -1;
    background-color: rgba(0, 0, 0, 0.514);
    padding: 10px;
    border-radius: 10px;
    border: 2px solid #000000;
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    flex-direction: column;
    word-wrap: break-word;
    word-break: break-all;
  }
  
  .outp .previous-operand {
    color: rgb(255, 255, 255);
    font-size: 1.5rem;
    font-family: Verdana, sans-serif;
  }
  
  .outp .current-operand {
    color: rgb(255, 255, 255);
    font-size: 2.5rem;
    font-family: Verdana, sans-serif;
  }
  
  ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    margin: auto;
  
  }
  
  li {
    float: left;
    margin: auto;
    border: 3px solid #000000;
    background-color: rgb(75, 12, 12);
  }
  
  li a, .dropbtn {
    display: inline-block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
  }
  
  li a:hover, .dropdown:hover .dropbtn {
    background-color: #6b0b0b;
  }
  
  li.dropdown {
    display: inline-block;
  }
  
  .dropdown-content {
    display: none;
    position: absolute;
    background-color: #921818;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
  }
  
  .dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
    margin: auto;
    border: 2px solid #000000;
  }
  
  .dropdown-content a:hover {
    background-color: #ff0000;
  }
  
  .dropdown:hover .dropdown-content {
    display: block;
  }