*{
    box-sizing: border-box;
}

body{
    font-family: sans-serif;
    margin: 0;
    background-image: url(./bg.jpg);
    color: white;
}

body a{
    text-decoration: none;
    color: white;
}

header{
    position: sticky;   
    align-items: center;
    display: flex;
    justify-content: space-around;
    background-color: black;
    padding: 10px;
    border-bottom: blue solid 3px;
    top: 0;
    
}

header img{
    max-height: 60px;
}

ul{
    gap: 15px;
    display: flex;
    list-style-type: none;
}

li a{
    transition: color 0.3s ease;
}

li a:hover{
    color: blue;
}


main > div{
    width: 40%;
}

main > div img{
    display: block;
    width: 100%;
}

main{
    justify-content: space-around;
    display: flex;
    flex-wrap: wrap;
    max-width: 800px;
    background-color: rgba(0, 0, 0, 0.651);
    padding: 30px;
    margin: 0 auto;
    border-left: blue solid 3px;
    border-right: blue solid 3px;
    border-bottom: blue solid 3px;
}


main img{
    max-width: 400px;
}

.warp{ 
    display: flex;
    width: 100%;
}

.warp_left, .warp_right{
    padding: 10px;
}

.warp_left{
    width: 60%;
}

.warp_right{
    width: 40%;
}

.warp_right img{
    width: 100%;
    display: block;
}

.ne{
    padding: 0 10px;
    width: 60%;
}

.ne h1{
    margin-top: 0;
}

.use{
    color: blue;
}

article>section{
    margin-bottom: 30px;
}