The ornamental design for a mattressborder with buttons, as shown and described.
FIG. 1 is a perspective view of a mattress border with buttons showing my new design.
FIG. 2 is a left elevation view of the mattress border with buttons of FIG. 1.
FIG. 3 is a right elevation view of the mattress border with buttons of FIG. 1.
FIG. 4 is a rear elevation view of the mattress border with buttons of FIG. 1.
FIG. 5 is a front elevation view of the mattress border with buttons of FIG. 1.
FIG. 6 is a top plan view of the mattress border with buttons of FIG. 1, which is identical to the opposite, bottom plan view of the mattress border with buttons of FIG. 1; and,
FIG. 7 is an enlarged view of a corner of the mattress border with buttons and is illustrative of a portion of each of FIGS. 1-5 showing the design shown in closer detail.
The broken lines shown in the drawings are for environmental purposes only and form no part of the claimed design. The areas encompassed by the broken lines form no part of the claimed design.