body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
}
.container {
    width: 300px;
    margin: 100px auto;
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
}
.container h2 {
    text-align: center;
    margin-bottom: 20px;
}
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    margin-bottom: 5px;
}
.form-group input[type="text"],
.form-group input[type="password"] {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 3px;
}
.form-group button {
    width: 100%;
    padding: 8px;
    border: none;
    background-color: #007bff;
    color: #fff;
    border-radius: 3px;
    cursor: pointer;
}
.form-group button:hover {
    background-color: #0056b3;
}




/* pop-up */
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0,0.4);
    padding-top: 60px;
}
.modal-content {
    background-color: #fefefe;
    margin: 5% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 400px;
}
.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}
.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}