The periods high price is shown by the shadow (thin line) above the candlesticks body. Notice this applies to both white or clear (bullish) and black or filled (bearish) candlesticks. The high price is shown on the bullish and bearish candlesticks below.
If there is no shadow above the body, then the high price is shown by the top of the candlesticks body, which also represents the opening price. This applies to both bullish (white) and bearish (black) candlesticks below.

