Dynamic width based on text width

I would like to place a container in the middle of the other container like on the image bellow. The middle container would have 2 elements. First would be text that would represent price ("####" on the image), the other would be image of a coin (blue circle) with a constant width (yellow arrow).

How can create this kind of gui knowing the price will increase, consenquently the width of inside container (red arrow) should as well? With changing of a price I would like to keep inside container to be centered ("a" on the left would be same as "a" on the right).