body {
    background: #008080;
    font-family: "Tahoma", sans-serif;
    color: black;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.window {
    width: 500px;
    background: #c0c0c0;
    border: 2px solid #fff;
    box-shadow: inset -2px -2px #808080, inset 2px 2px #dfdfdf;
}

.window-titlebar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(to right, #000080 0%, #1084d0 100%);
    color: white;
    padding: 3px 5px;
    font-weight: bold;
    height: 18px;
    box-shadow: inset 1px 1px #1a1a8a, inset -1px -1px #0a0a4a;
}

.window-title {
    font-size: 12px;
    text-shadow: 1px 1px 0 #000;
}

.window-buttons button {
    background: #c0c0c0;
    border: 1px solid #808080;
    width: 16px;
    height: 16px;
    font-size: 12px;
    font-weight: bold;
    cursor: pointer;
    box-shadow: inset 1px 1px #fff, inset -1px -1px #404040;
}

.window-buttons button:active {
    box-shadow: inset -1px -1px #fff, inset 1px 1px #404040;
}

.window-content {
    padding: 10px;
    background: #dfdfdf;
    box-shadow: inset 1px 1px #fff, inset -1px -1px #808080;
}