That is the flag of the Red Cross, not of a country. The flag of Switzerland has a red background with a white cross. The flag of Tonga has a red cross on a white field, the corner of a red flag.
The Red Cross flag is a red cross with arms of equal length on a white background. So the two colours are red and white.
The Swiss Flag is a white cross on a white ground. No Switzerland's flag is a white cross with a red background.
The "International Committee of the Red Cross" Additionally, England.
The flag of Switzerland has a red background and white cross (+). The flag of Scotland, the Saltire, has a dark blue background and a white cross (X). The flag of Denmark has a red background and white cross (+).
Blue with a red cross outlined in white extending to the edges of the flag; the vertical part of the cross is shifted to the hoist side in the style of the Dannebrog (Danish flag).It is mainly blue, with a red cross on a white cross in it too.
There are two red crosses on the Union Flag. The 'plus' cross is from the English flag and the 'multiplication' crass is from the Ulster flag.
Red flag with a white cross
The flag of Switzerland.
The flag of England is a red cross in a white background, the red cross looks very thick.
It has a white background and a red (plus sign) cross on it.
The cross is white and the background is red. The flag is called the "Dannebrog".