*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
header{
     background-color: rgb(170, 170, 253);
     padding: 3em;
     color: aliceblue;
     text-align: center;
     

}
section>nav{
    float: left;
    width: 30%;
    background-color: rgb(247, 247, 166);
    padding: 1.5em;
    height: 250px;


}
section>nav>ul{
    list-style: none;
}
section>nav>ul>li>a{
    text-decoration: none ;
    color: rgb(15, 246, 169);
}
article{
    padding: 20px;
    width: 70%;
   /* background-color: darkseagreen;*/
    float: left;
    
}
footer{
    background-color: pink;
    padding: 20px;
    text-align: center;
}

.clearfix::after{
    content: '';
    display: block;
    clear: both;
    overflow: hidden;
}

/*반응형 웹*/
@media screen and (max-width:600px) {
    section>nav,article{
        width: 100%;
        height: auto;
    }
}