This is a lovely sentiment! To make it even better for a wedding anniversary message, you could add some personalization. Here are a few options, depending on your relationship with the couple:
Option 1 (For close friends or family):
"Happy Anniversary, [Couple's Names]! Wishing you both a day filled with as much love and joy as you've shared throughout your years together. Thinking of you and celebrating your amazing journey!"
Option 2 (More formal, for acquaintances or colleagues):
"Happy Anniversary, [Couple's Names]! Congratulations on celebrating another year of marriage. Best wishes for continued happiness."
Option 3 (If you know something specific about their relationship):
"Happy Anniversary, [Couple's Names]! Remember that [insert a specific happy memory or inside joke]? Wishing you many more years of laughter, love, and making memories together!"
Remember to replace "[Couple's Names]" with their actual names. Adding a personal touch makes the message more meaningful and heartfelt.