index4.css

body {
    background-color: steelblue;
}

.box {
    /* border:2px solid black; */
    display: inline-block;
    margin-left: 35vw;
    margin-top: 20vh;
    /* text-align: center; */
    background-color: white;
    border-radius: 10px;
    height: 60vh;
    width: 25vw;
}

.in {
    font-weight: bold;
    width: 250px;
    height: 20px;
    text-align: center;
}

.but {
    display: inline;
    width: 34px;
    height: 30px;
    color: azure;
    border-radius: 50px;
    cursor: pointer;
    background-color: darkviolet;
    border: 2px solid white;
    font-size: larger;
}

button.but:hover {
    background-color: forestgreen;
}

.butt {
    display: inline;
    width: 28px;
    height: 29px;
    color: azure;
    border-radius: 50px;
    cursor: pointer;
    background-color: darkviolet;
    border: 2px solid white;
    font-size: larger;
    text-align: center;
    margin: 10px;
}

button.butt:hover {
    background-color: crimson;
}

.heading {
    color: white;
    background-color: darkviolet;
    text-align: center;
}

.para {
    text-align: center;
    display: unset;
    margin-left: 20px;
    margin-bottom: 40px;
}

ul {
    list-style-type: none;
    /* display: inline; */
}

li {
    display: inline-block;
    color: darkmagenta;
}