demo-tag { display: inline; position: relative; }
demo-tag::before { content: "Demo:"; font-size: 18px; left: 5px; position: absolute; top: 3px; }
demo-container { display: block; border: 2px solid rgb(189, 189, 189); padding: 25px 10px 10px; border-radius: 4px; 
width: 360px;
position: relative;
height: 180px;
}
demo-object { 
display: block;
width: 70px;
height: 35px;
background: rgb(224, 64, 251);
position: fixed;
position-area: top;
 }


block-anchor {
display: block;
width: 80px;
height: 40px;
background: rgb(79, 142, 247);
anchor-name: --myAnchor;
margin: 70px auto 0px;
}

.element {
position-anchor: --myAnchor;
}