body{
font-family: Arial;
margin:0;
background:#f5f5f5;
}

header{
background:#111;
color:white;
}

.topbar{
display:flex;
justify-content:space-between;
align-items:center;
padding:10px 20px;
}

.menu ul{
display:flex;
flex-wrap:wrap;
list-style:none;
}

.menu li{
margin:10px;
}

.menu a{
color:white;
text-decoration:none;
}

.slider{
display:flex;
overflow:auto;
}

.slide{
margin:20px;
}

.category-block{
margin:30px;
}

.article img{
width:100%;
}