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$ ruby -pne '$_.gsub!(/\d+px/,"40px") if /^\s+height/ && !$_["-"]' file
height: 40px;
line-height: 1.5em;
height: 40px;
height: 40px;
height: 40px;
line-height: 17px;

for 1
sed -n '/^ [^-].*height/p' file1>file2
for 2
awk '/[^-]height/{sub(/[0-9]*px/,"40px")}1' file2

But your desired output does include words with hyphen!
As can be seen here -



So do you want to display lines that have "-height" or not ?
Do the following:

(a) Post a sample input file....