html, body {
    margin: 0;
    padding: 0;
    overflow: hidden;
}
body {
    font-family: Arial, sans-serif;
    background-color: #85b7a4;
}
#container {
    width: 100vw;
    height: 100vh;
    margin: 0 auto;
    text-align: center;
}
#header {
    font-size: 60px;
    font-weight: bold;
    margin: 20px auto;
    padding: 10px 20px;
}
#input-area {
    width: 60vw;
    height: calc(60vh - 100px);
    border: none;
    border-radius: 20px;
    padding: 20px;
    background: #85b7a4;
    color: #636ddc;
    box-shadow:
            inset -5px -5px 10px rgba(255,255,255,0.5),
            inset 5px 5px 10px rgba(0,0,0,0.2);
}
#input-area:focus {
    outline: none;
}
#download-button {
    display: block;
    padding: 10px 20px;
    margin: 20px auto 0;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    background-color: #636ddc;
    box-shadow:
            -3px -3px 15px rgba(255,255,255,0.5), 
            3px 3px 15px rgba(0,0,0,0.2)
}
#download-button:hover {
    box-shadow:
            inset -5px -5px 15px rgba(255,255,255,0.5), 
            inset 5px 5px 15px rgba(0,0,0,0.3)
}