and the transparent board 16 can be omitted while extending the first board 121 of the second supporting element 12 to engage with the first board 111 of the first supporting element 11 the first board 121 can be made of transparent material to allow the light from the led 133 to pass through two blocks are set on the front end of the first board 121 to engage with the first positioning hole 444 the first pivot post 17 can be mounted on the first supporting element 11 or the second supporting element 12 when the notebook computer does not need light the second supporting element 11 and the circuit board 13 can be omitted while the second projections 151 are set on the front end of the operating portion 111 and the first projections 1231 is set on the bottom of the fixing portion 113 the sliding slot 46 can be defined in just one of the upper cover 30 and the lower cover 40 referring to fig3 in assembling the support stand 10 the first end 1431 of the spring 143 is engaged with the first engaging block 1413 of the first connecting element 141 and the second end 1432 of the spring 143 is engaged with the second engaging block 1423 of the second connecting element 142 the post of the fastener 144 passes through the through hole 1421 of the second connecting element 142 and the coil portion to be fastened to the knob 1412 of the first connecting element 141 to pivotally connect the.