I have two div
in my page. When I apply a border to these boxes, they get margin from top; but when no border is applied, the boxes are displayed with no margin. Why?
.header {
width: auto;
height: 100px;
background-color: gray;
text-align: center;
line-height: 50px;
border: 1px solid black;
}
.menu {
background-color: green;
height: 80px;
border: 1px solid black;
}
<div class="header">
<h1>title</h1>
</div>
<div class="menu"></div>