main {
    display: grid;
    grid-template-areas: 'header heaeder header'
    'man man man'
    'section1 section2 section3'
    'footer footer footer'
    ;
    gap: 20px;  
}
main > * {
    background-color: skyblue;
    border-radius: 10px;
}
h1 {
    grid-area: header;
    text-align: center;
}

img {
    grid-area: man;
    margin-left: auto;
    margin-right: auto;
}
.section1 {
    grid-area: section1;
}

.section2 {
    grid-area: section2;
}
.section3 {
    grid-area: section3;
}
footer {
    grid-area: footer;
}