style.css

body {
    
    background-color: rgb(31, 201, 231);
}

input[type=number]::-webkit-inner-spin-button, 
input[type=number]::-webkit-outer-spin-button { 
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    margin: 0; 
}

#main-box {
    background-color: grey;
    position: relative;
    margin-left: 200px;
    margin-right: 200px;
    width: 50%;
    border-radius: 16px;
    border: 1px solid black;
}

header {
    background-color: purple;
}

h3 {
    text-align: center;
    color: white;
}

#bill-info {
    text-align: center;
    background-color: grey;
    border-radius: 16px;
}

#main-option {
    color: rgb(169, 166, 170);
}

#calculate {
    background-color: red;
}
#numOfPeople {
    margin-bottom: 10px;
}
#placehold {
    color: rgb(210, 255, 105);
}