style.css

* {
    margin: 0 !important;
}

body {
    font-family: Arial;
}

h1 {
    text-align: center;
    padding: 20px;
}

hr {
    width: 50% !important;
    margin: auto !important;
}

input, button {
    padding: 20px;
}

.form-control {
    margin-top: 20px !important;
    width: 400px !important;
    margin-bottom: 20px !important;
    margin-left: auto !important;
    margin-right: auto !important;
    text-align: center !important;
}

.button-div {
    width: 50%;
    margin: auto;
}