css - height:auto after div position -

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there frame consisting of 3 sections top bottom. bottom covering section 3 relative area

in 1 part absolute height 100px 2 sections height of non-auto in section 3 2 after auto replace div want place absolute location data 2 auto not mean 3 how think should part div css?

friendly speaking, question not clear... far understand picture, want put red div under 2 absolutely positioned divs (green , yellow).

you can absolutely position red div inside yellow div , make top value more 100%, so:

.red-div {     position: absolute;     left: 0;     top: 100%;     margin-top: 20px;     width: 100%;     height: 40px; }

or if know height of yellow , green divs together, can just

.red-div {     margin-top: (sum of yellow , green heights , there margins) px; }

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