<div style=" color:#222; font-size:12px; font-family:tahoma;
position: fixed;
top:30px;
left:0px;
transform: rotate(-45deg);">
ادعم فلسطين
</div>
<div style=" width: 0px;
height: 0px;
border-left: 0px solid transparent;
border-right: 100px solid transparent;
border-top: 90px solid #f00;
position:fixed;
top:0px;
left:0px;
z-index:-1;" >
</div>