*{
    padding: 0;
    margin: 0;
}

body{
    width: 100%;
    height: 100vh;
    background: linear-gradient(to bottom, red, orange);
}

#input{
    position: relative;
    display: block;
    margin: auto;
    height: 50px;
    top: 100px;
    background-color: black;
    color: white;
    text-align: center;
    font-family: sans-serif;
    font-size: 40px;
}

#btn1 {
    position: relative;
    display: block;
    margin: auto;
    width: 100px;
    height: 50px;
    top: 100px;

    font-size: 30px;

    background-color: darkslategrey;
}

#btn1:hover{
    background-color: gray;
}

#result{
    position: relative;
    top: 100px;
    font-family: sans-serif;
    text-align: center;
}