changed to add instead of set to be competiable with other scripts(swup/transition.js)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/js/header.js b/src/js/header.js
index e6c32068..63f0e6d3 100644
--- a/src/js/header.js
+++ b/src/js/header.js
@@ -18,7 +18,7 @@ mainHeader.innerHTML = `
 `;
 
 header.appendChild(mainHeader);
-document.getElementById("btn"+page).setAttribute('class', 'active');
+document.getElementById("btn"+page).classList.add('active');
 
 window.onscroll = event => {
 let header = document.querySelector('header');