/* Remove default spacing */
* {
    margin: 0;
    padding: 0;
}


/* Page style */
body {
    font-family: Arial, sans-serif;
    background-color: lightgray;
}


/* Header */
header {
    background-color: navy;
    color: white;
    text-align: center;
    padding: 20px;
}


/* Navigation */
nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    background-color: black;
    padding: 10px;
}


nav a {
    color: white;
}


/* Grid layout */
.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    padding: 20px;
}


/* Content boxes */
.box {
    background-color: white;
    padding: 15px;
    border: 1px solid black;
    min-height: 250px;
}


/* Image size */
img {
    width: 100%;
}


/* Tablet layout */
@media screen and (max-width: 800px) {

    .grid {
        grid-template-columns: 1fr 1fr;
    }

}


/* Phone layout */
@media screen and (max-width: 500px) {

    .grid {
        grid-template-columns: 1fr;
    }


    nav {
        flex-direction: column;
        text-align: center;
    }

}


/* Footer */
footer {
    padding: 20px;
    text-align: center;
}