* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Courier New', Courier, monospace;
}

body {
    background-color: #1c1c1c;
}

section {
    border-top: 2px solid rgb(0, 255, 0);
    border-bottom: 2px solid red;
    border-left: 2px solid blue;
    border-right: 2px solid yellow;
    height: 500px;
    width: 400px;
    border-radius: 20px;
    margin: 50px auto;
}

#display {
    border: 2px solid white;
    border-radius: 20px;
    width: 95%;
    padding: 10px;
    background-color: #1e1e1e;
    height: 100px;
    font-size: 24px;
    font-weight: 600;
    margin: 10px auto;
    text-align: left;
    letter-spacing: 5px;
    white-space: nowrap;
    overflow-x: auto;
    color: #00ffcc;
    box-shadow: inset 0px 0px 10px #00ffcc33, 0 0 10px #000;
    text-shadow: 1px 1px 15px #00ffcc;
}

.btn {
    font-size: 24px;
    padding: 15px;
    transition: 0.3 all ease;
    margin: 12px;
    color: white;
    /* border: 2px solid yellow; */
    background-color: #3b3b3b;
    border-radius: 10px;
    transition: transform 0.3s ease;
    cursor: pointer;
}

.btn:hover {
    box-shadow: 1px 1px 15px yellow;
    transform: scale(1.1);
    color: rgb(0, 255, 0);
}

#result {
    padding: 15px;
    transition: 0.3 all ease;
    margin: 10px;
    font-size: 24px;
    color: white;
    background-color: transparent;
    border: 2px solid rgb(0, 166, 255);
    box-shadow: 1px 1px 10px rgb(0, 166, 255);
    border-radius: 10px;
}


#clear {
    padding: 15px;
    transition: 0.3 all ease;
    margin: 10px;
    font-size: 24px;
    color: white;
    background-color: transparent;
    border: 2px solid rgb(0, 166, 255);
    box-shadow: 1px 1px 10px rgb(0, 166, 255);
    border-radius: 10px;
}

.divider {
    margin: 15px auto;
    width: 90%;
    border: 2px solid ;
}