FIG. 1 is a perspective view of an embodiment of our design for a computer keyboard support; FIG. 2 is a top plan view of the computer keyboard support of FIG. 1; FIG. 3 is a bottom plan view of the computer keyboard support of FIG. 1; FIG. 4 is a rear end elevation view of the computer keyboard support of FIG. 1; FIG. 5 is a front end elevation view of the computer keyboard support of FIG. 1; FIG. 6 is a left side elevation view of the computer keyboard support of FIG. 1; FIG. 7 is a right side elevation view of the computer keyboard support of FIG. 1; FIG. 8 is a perspective view of a second embodiment of our design for a computer keyboard support; FIG. 9 is a top plan view of the computer keyboard support of FIG. 8; FIG. 10 is a bottom plan view of the computer keyboard support of FIG. 8; FIG. 11 is a rear end elevation view of the computer keyboard support of FIG. 8; FIG. 12 is a front end elevation view of the computer keyboard support of FIG. 8; FIG. 13 is a left side elevation view of the computer keyboard support of FIG. 8; and, FIG. 14 is a right side elevation view of the computer keyboard support of FIG. 8.