body {
    font-family: 'Orbitron';
    background-color: #49515a;
}

.text-center {
    text-align: center;
}

.calculator {
    height: 500px;
    width: 300px;
    margin-top: 5%;
    margin-bottom: 5%;
    margin-left: auto;
    margin-right: auto;
    background-color: #dfd8d0;
    border: 2px solid #908b85;
    border-radius: 20px;
    box-shadow: 7px 10px 34px 1px rgba(0, 0, 0, 0.68), inset -1px -6px 12px 0.1px #89847e;
}

.title {
    padding-top: 10px;
    padding-bottom: 10px;
    font-family: 'Orbitron';
}

.calculator-screen {
    width: 85%;
    height: 65px;
    margin-left: 18px;
    margin-right: 10px;
    background-color: #c3c2ab;
    font-size: 35px;

}

.cal-screen {
    /* width: 85%;
    height: 65px; */
    margin-left: auto;
    margin-right: auto;
    border: 2px solid #b4b39d;
    border-radius: 6px;
    background-color: #c3c2ab;
  
}

input {
    font-family: 'Orbitron';
}

.calculator-keys {
    width: 100%;
    margin-top: 15px;
}

.row {
    display: flex;
}

button {
    font-size: 16px;
    background-color: #515151;
    /* border: 8px solid #dfd8d0; */
    color:#fff;
    width: 25%;
    outline: none;
    height: 50px;
    margin: 0 4px 10px 8px;
    /* margin-top: 20x; */
    border-radius: 10px;
    /* box-shadow: 0px 3px 0px 0px #222121, inset -1px -3px 10px 1px #515151 */
}


.all-clear, .zero-btn{
    width: 50%;
}

.operator, .equal-sign{
    background-color: orange;
    /* margin: 0px 4px 0px 0px; */
}

button:hover {
    background-color: darkgrey;
}

.operator:hover, .equal-sign:hover{
    background-color: darkorange;
}

/* button another theme */
.btn-theme-page {
    text-align: right;
}

a {
    text-decoration: none;
    display: inline-block;
    padding: 8px 16px;
}
  
  a:hover {
    background-color: #ddd;
    color: orange;
  }
  
  .btn-theme-1 {
    background-color: #f1f1f1;
    color: orange;
    border-radius: 20px;
  }
  
  .btn-theme-2 {
    background-color: orange;
    color: white;
    border-radius: 20px;
  }