body {
    background-color: #c0c0c0;
    font-family: Arial, Helvetica, sans-serif;
    color: #000;
}

.container {
    width: 400px;
    margin: 40px auto;
    padding: 10px;
    background-color: #d4d0c8;
    border: 2px solid #808080;
    box-shadow: inset -2px -2px 0 #fff, inset 2px 2px 0 #404040;
}

h2 {
    font-size: 16px;
    margin-bottom: 10px;
    text-align: center;
}

textarea {
    width: 100%;
    height: 80px;
    resize: none;
    border: 2px solid #808080;
    background: #fff;
    padding: 5px;
    font-family: inherit;
    box-sizing: border-box;
}

.controls {
    margin: 10px 0;
    text-align: center;
}

button {
    background-color: #d4d0c8;
    border: 2px solid #fff;
    border-right-color: #404040;
    border-bottom-color: #404040;
    padding: 5px 10px;
    margin: 0 5px;
    cursor: pointer;
}

button:active {
    border: 2px solid #404040;
    border-right-color: #fff;
    border-bottom-color: #fff;
}

.result-box {
    min-height: 50px;
    background: #fff;
    border: 2px solid #808080;
    padding: 5px;
}