body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display:flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f4f4f9;
}

.container {
    text-align: center;
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.target-box {
    width: 300px;
    height: 200px;
    line-height: 200px;
    margin: 20px auto;
    border: 2px dashed #007bff;
    border-radius: 10px;
    color: #007bff;
    cursor: pointer;
    transition: background 0.3s;
}

.target-box:hover {
    background: #e7f3ff;
}