img {
    display: block;
    margin-left: auto;
    margin-right: auto;
    height: "300";
}

h1 {
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 60px;
    line-height: 15px;
}

h2 {
    text-align: center;
    font-family:Arial, Helvetica, sans-serif;
    font-size: 22px;
    line-height: 15px;
    color: darkslategrey;
}

h3 {
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 20px;
    line-height: 5px;
    color: darkslategrey;
}

.container {
    display: block;
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    line-height: 50px;    
}

#input-btn {
    display: block;
    margin: 0 auto;
    padding: 10px 20px;
    background-color: #F6D254;
    color: rgb(0, 0, 0);
    font-size: 18px;
    border: 2px solid black;
    cursor: pointer;
    height: 50px;
    border-radius: 10px;
}

#output-field {
    display: inline-block;
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    margin-top: 20px;
    margin-bottom: 0px;
    font-size: 50px;
    font-weight: bold;
    background-color: #f6d35488;
    border: 2px solid black;
    padding: 10px 20px;
    border-radius: 10px;
}

h4 {
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 25px;
    color: darkslategrey;
}