The first nineteen days of the month fall during the season of Lent which is represented by the liturgical color violet or purple — a symbol of penance, mortification and the sorrow of a contrite heart.
April 20th is Easter Sunday and the beginning of the Easter season. The liturgical color is white — the color of light, a symbol of joy, purity and innocence (absolute or restored).
For the use of the new technologies: Let us pray that the use of the new technologies will not replace human relationships, will respect the dignity of the person, and will help us face the crises of our times. (See also http://popesprayerusa.net/popes-intentions/)