body {
    font-family: Arial, sans-serif;
    margin: 0;
}

header {
    background-image: url('stars.jpg'); /* Replace 'stars.jpg' with your image file */
    background-size: cover;
    color: white;
    text-align: center;
    padding: 50px;
}

nav {
    float: left;
    width: 20%;
    background-color: #006400; /* Dark green */
}

.links-box {
    padding: 20px;
}

.links-box ul {
    list-style-type: none;
    padding: 0;
}

.links-box a {
    text-decoration: none;
    color: #333;
    font-weight: bold;
    transition: color 0.3s ease; /* Smooth transition for color change */
}

.links-box a:hover {
    color: #fff; /* Change color on hover */
}

.text-box {
    margin-left: 25%;
    padding: 20px;
}

main {
    margin-left: 25%;
    padding: 20px;
}

.sample-heading-column {
    float: left;
    width: 30%;
    margin-right: 5%;
    margin-bottom: 20px;
    background-color: #90EE90; /* Light green */
    padding: 20px;
    box-sizing: border-box; /* Include padding in width calculation */
}

.sample-heading-column:nth-child(1) {
    margin-left: 0;
    margin-right: 5%;
}

.sample-heading-column:nth-child(2) {
    margin-left: auto;
    margin-right: auto;
}

.sample-heading-column:nth-child(3) {
    margin-left: 5%;
    margin-right: 0;
}

footer {
    background-color: #001f3f;
    color: white;
    text-align: center;
    padding: 20px;
    clear: both; /* Clear floats */
}