RGB Color Code を RGBA Color Code に変換

• #aaffff
  R　G　B
  170 / 255 / 255
  rgba(170,255,255,0.5)
• #ffddff
  R　G　B
  255 / 221 / 255
  rgba(255,221,255,0.5)
• #aacfff
  R　G　B
  170 / 207 / 255
  rgba(170,207,255,0.5)
• #ffddcc
  R　G　B
  225 / 221 / 204
  rgba(225,221,204,0.5)
• #ccffcc
  R　G　B
  204 / 225 / 204
  rgba(204,225,204,0.5)
• #ffbbbb
  R　G　B
  225 / 187 / 187
  rgba(225,187,187,0.5)