This seems basic but I am new to QGIS and I can't find how to do it. I have three shape files each with the same attribute. Each shape file is imported into its own layer. Each shape file has attribute values in the range 1-100, but different sub-sets of those values are present in each file.
I want a color ramp where attribute value 62 (for example) has the same color on all three layers, but the colour ramp I am using assigns a different color to value 62 on each layer. I think it is because the range of values in each layer is different. I think my color ramp is a continuous range and not discrete colours tied to a discrete value.
How do I build a ramp where the full range of values is covered and a given value always has the same color on different layers?