main.css

body{
    font-family: 'Roboto', sans-serif;
    background-color: #003f91;
    margin: 0 auto;
}

.wrap-box{
    background-color: #ffffff;
    max-width: 1200px;
    box-sizing: border-box;
    padding: 40px;
    margin: 0 auto;
    margin-top: 40px;
}

textarea{
    resize: none;
    width: 500px;
    height: 400px;
    border: solid #000000 1px;
    font-family: 'Roboto', sans-serif;
    padding: 20px;
}

button{
    background-color: #003f91;
    border: none;
    padding: 10px 20px 10px 20px;
    color: #ffffff;
    font-weight: bold;
    cursor: pointer;
    font-size: 1.5em;
    display: block;
    margin-top: 20px;
}

button:hover{
    background-color: #5da9e9;
}

a{
    color: #003f91;
    text-decoration: none;
}

a:hover{
    color: #5da9e9;
}

.output-area .inner{
    padding: 20px;
    background-color: lightblue;
    border: 1px dashed #003f91;
    max-width: 500px;
    font-family: 'Times New Roman', Times, serif;
}