body, html {
    margin: 0px;
    padding: 0px;
}
header {
    width: 100%;
    background-color: blueviolet;
    color: aliceblue;
}
main {
    display: flex;
    gap: 15px;
}
.container1 {
    width: 30%;
    background-color: cyan;
    padding: 15px;
}
.container2 {
    width: 40%;
    background-color: cyan;
    padding: 15px;
}