*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
img{
    width: 100%;
    height: 100%;
    max-width: 100%;
    display: block;
}
body, ul, li, p {
    list-style: none;
    font-size: 1.2rem;
    font-family: Arial;
}
a{
    text-decoration: none;
    color: white;
}

h1{
    text-align: center;
    margin-top: 100px;
}

.header{
    background-color: black;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}
.menu{
    display: flex;
}
.menu >  li{
    margin-left: 10px;
}
.menu >  li a{
    padding: 20px 10px 5px 10px;

}
.menu >  li a:hover{
    border-bottom: 2px solid yellow;
}
.max{
    width: 260px;
    height: 230px;
    margin: 0 auto;
}
/*Css flex box 1*/

.flex{
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
}
hr{
    margin: 50px 0 50px 0;
    border: 5px solid black;
}
.flex > div{
    flex: 1 1 0px;
    margin: 30px 0 0 0;
}

/*CSS grid 1*/

.grid1{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    max-width: 980px;
    grid-gap: 25px;
    margin: auto;
    
}