* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    width: 100%;
}

.header-image {
    width: 100%;
    height: auto;
    display: block;
}

.main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f5f5f5;
}

.hello-text {
    font-size: 72px;
    font-weight: bold;
    color: #333;
}

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

.footer p {
    font-size: 18px;
}