body, h1, h2, h3, p, ul, ol{
    margin: 0%;
    padding: 0%;
}


body{
    font-size: 16px;
    background-color: rgb(255, 251, 0);
    font-family: Arial, Helvetica, sans-serif;
}

header {
    display: flex;
    justify-content: first baseline;
    align-items: center;
    height: 60px;
    color: black;
    background-color: rgb(79, 162, 173);
}
.header_menu{
    padding: 20px;
    display: flex;
    list-style: none;
    width: 100%;
    justify-content: center;
}
.menu_item a {

    padding: 10px;
    color: white;
    font-size: 20px;
    text-decoration: none;
    transition: all 0.5s;

}
.menu_item a:hover {
    background-color: aqua;


}