body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
}

header {
    background-color: #2c3e50;
    color: white;
    padding: 15px;
    text-align: center;
}

main {
    max-width: 1000px;
    margin: 20px auto;
    padding: 10px;
}

section {
    margin-bottom: 30px;
    overflow: hidden;
}

h2 {
    background-color: #eee;
    padding: 10px;
    border-left: 5px solid #2c3e50;
}

article {
    width:45%;
    float: left;
    background-color: white;
    border: 1px solid #ddd;
    text-align: center;
    margin: 2%;
}

article img {
    max-width: 100%;
    height: auto;
}

button {
    background-color: #2c3e50;
    color: white;
    padding: 10px 20px;
    border: none;
}

button:hover {
    background-color: #689fd5;
}

footer {
    background-color: #333;
    color: white;
    padding: 20px;
    text-align: center;
}

footer a {
    color: #3498db;
}

@media screen and (max-width: 500px) {
    h2{
        padding: 20px;
        text-align: center;
    }
    article {
        padding: 50px;
        margin-left: 15%;
        margin-bottom: 10%;
    }
}

@media screen and (min-width: 501px) and (max-width: 900px) {
    h2{
        padding: 20px;
        text-align: center;
    }
    article {
        padding: 50px;
        margin-left: 20%;
        margin-bottom: 10%;
    }
}