Flag of Sweden color blue
The national flag of Sweden (Swedish: Sveriges flagga) consists of a yellow or gold Nordic cross (i.e. a horizontal cross extending to the edges, with the crossbar closer to the hoist than the fly) on a field of light blue. The Nordic cross design traditionally represents Christianity. The design and colours of the Swedish flag are believed to have been inspired by the present coat of arms of Sweden of 1442, which is blue divided quarterly by a cross pattée of gold, and modelled on the Danish flag. Blue and yellow have been used as Swedish colours at least since Magnus III's royal coat of arms of 1275.State flag and civil ensign
The dimensions of the Swedish flag are 5:2:9 horizontally and 4:2:4 vertically. The dimensions of the Swedish flag with a triple-tail are 5:2:5:8 horizontally and 4:2:4 vertically. The colours of the flag are officially established through the Natural Color System to be NCS 0580-Y10R for the shade of yellow, and NCS 4055-R95B for the shade of blue. They are also specified to Pantone PMS 301 C/U for blue and PMS 116 or PMS 109 U for yellow. The square-cut Swedish state flag is identical to the civil ensign. The Swedish law does not regulate the design of the Swedish pennant, but it is recommended that its colour scheme should correspond with that of the flag.History
Mythology
According to early modern legend, the 12th-century King Eric IX saw a golden cross in the sky as he landed in Finland during the First Swedish Crusade in 1157.  Seeing this as a sign from God he adopted the golden cross against a blue background as his banner.
It has been suggested that the Swedish origin legend is chosen to counter a parallel origin story for the Danish flag, also recorded in the 16th century.
According to this theory, the Swedish flag was created during the reign of King Charles VIII, who also introduced the coat of arms of Sweden in 1442. The national coat of arms is a combination of King Albert's coat of arms of 1364 and King Magnus III's coat of arms of 1275, and is blue divided quarterly by a golden cross pattée.
Other historians claim that the Swedish flag was blue with a white cross before 1420, and became blue with a golden cross only during the early reign King Gustav I, who deposed King Christian II in 1521.
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