In brief
background-repeat controls image repetition along both axes. repeat-x repeats horizontally, while no-repeat leaves a single image.
Useful to know
background-repeat controls image repetition along both axes. repeat-x repeats horizontally, while no-repeat leaves a single image. [1]
If a small icon tiles across an entire card, default repetition may be responsible rather than an incorrect file. Choose repetition separately from size and position; the three settings solve different problems.
Sources
For further detail and to check the information: