body {
    font-family: 'Arial', sans-serif;
    background: #f7f7f7;
    margin: 0;
    padding: 20px;
    text-align: center;
}

.post-ad-form {
    background: #fff;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border-radius: 8px;
}

input[type=text],
input[type=email],
textarea,
input[type=file] {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    padding: 10px 20px;
    margin-top: 10px;
    background-color: #5cb85c;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1em;
}

button:hover {
    background-color: #4cae4c;
}

#adForm {
    margin-bottom: 40px;
}

#adsList {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}

.ad {
    background: white;
    border: 1px solid #ddd;
    padding: 20px;
    margin: 10px;
    width: calc(33.333% - 20px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border-radius: 8px;
}

.ad h3 {
    color: #5cb85c;
    margin: 0 0 10px 0;
}

.ad p {
    color: #555;
    font-size: 0.9em;
    line-height: 1.6;
    margin: 0 0 10px 0;
}

#message {
    color: #d9534f;
    margin: 10px 0;
}

/* Responsive design adjustments */
@media (max-width: 768px) {
    .ad {
        width: calc(50% - 20px);
    }
}

@media (max-width: 480px) {
    .ad {
        width: 100%;
    }
}