* {
            margin: 0px;
            padding: 0px;
            box-sizing: border-box;
            font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
        }

        .overallWrapper {
            width: 100%;
            height: 100vh;
            background-color: #e5e5e5;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        .overallWrapper h1 {
            margin-bottom: 30px;
            font-size: 36px;
            color: #555;
            letter-spacing: -1px;

        }

        .overallWrapper h1 span {
            color: #ff5000;
        }

        .overallWrapper p {
            margin-top: 30px;
            font-style: italic;
        }

        .innerWrapper {
            width: 350px;
            background-color: #f5f5f5;
            padding: 20px;
            box-shadow: 1px 2px 3px #777;
            border-radius: 10px;
        }

        .screenContainer {
            width: 100%;
            margin-bottom: 20px;
        }

        .screenContainer input {
            width: 100%;
            height: 70px;
            border-radius: 10px;
            border: none;
            background-color: #000;
            color: #fff;
            padding: 0px 20px;
            font-size: 28px;
            text-align: right;
        }

        .buttonsContainer {
            width: 100%;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
        }

        .buttonsBox {
            width: 100%;
            display: flex;
            justify-content: space-between;
            margin: 10px;
        }

        .buttonsBox .btn, .equalBtn, .cancleBtn {
            padding: 20px 25px;
            border: none;
            font-size: 16px;
            border-radius: 50%;
            background-color: #fff;
            box-shadow: 3px 2px 3px #999;
            cursor: pointer;
        }

        .buttonsBox .btn:nth-child(4){
            background-color: #e1e1e1;
        }

        .equalBtn {
            background-color: #ff5000;
            color: #fff;
            font-weight: 500;
        }