@import url('http://fonts.googleapis.com/css2?family=Orbitron&display=swap');

h1{
    text-align: center;
    font-size: 40px;
}
.calculator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 10px;
    border-radius: 1em;
    height: 380px;
    width: 400px;
    margin: auto;
    background-color: rgb(26, 23, 23);
    box-shadow: rgba(0, 0, 0, 0.19) 0px 10px 20px, rgba(0, 0, 0, 0.23) 0px 6px 6px;
}

.display-box {
    font-family: 'Orbitron', sans-serif;
    font-size: medium;
    font-weight: bolder;
    background-color: #dcdbe1;
    border: solid black 0.5px;
    color: black;
    border-radius: 5px;
    width: 90%;
    height: 65%;
}

#btn {
    background-color: burlywood;
}

input[type=button] {
    font-family: 'Orbitron', sans-serif;
    font-size: medium;
    font-weight: bolder;
    background-color: rgb(184, 184, 147);
    color: black;
    border: solid black 0.5px;
    width: 100%;
    height: 70%;
    border-radius: 5px;
    outline: none;
}

input:active[type=button] {
    background: #e5e5e5;
    -webkit-box-shadow: inset 0px 0px 5px #c1c1c1;
    -moz-box-shadow: inset 0px 0px 5px #c1c1c1;
    box-shadow: inset 0px 0px 5px #c1c1c1;
}