fix ios iframe issue

threejs/threejs-picking-gpu.html

@@ -8,7 +8,6 @@
     <style>
     body {
         margin: 0;
-        position: fixed;
     }
     #c {
         width: 100vw;

threejs/threejs-picking-raycaster-complex-geo.html

@@ -8,7 +8,6 @@
     <style>
     body {
         margin: 0;
-        position: fixed;
     }
     #c {
         width: 100vw;

threejs/threejs-picking-raycaster-transparency.html

@@ -8,7 +8,6 @@
     <style>
     body {
         margin: 0;
-        position: fixed;
     }
     #c {
         width: 100vw;