body{
    background-color: grey;
}

h1{
    text-align: center;
    margin: 0 auto;
    font-size: 5em;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}

img{
    width: 100%;
    border-radius: 10px;
}

.jumbotron{
    border-radius: 10px;
    margin-top: 5px;
}

input[type=number]{
    margin: 3px;
    border-radius: 5px;
    height: 40px;
}

input[type=reset]{
    margin: 3px;
    margin-left: 50px;
    font-size: 20px;
}

::placeholder{
    font-size: 15px;
    padding-left: 10px;
    color: brown;
}

#result{
    color:green;
    background-color: whitesmoke;
    padding: 5px;
    text-align: center;
}

article{
    background-color: #edf1fe;
    padding: 10px;
    font-weight: bold;
    color: darkgoldenrod;
    text-align: center;
}