#menu2 a {
width: 170px;
height: 29px;
text-align: center;
display: inline-flex;
justify-content: center;
align-items: center;
margin: 0 0 2px;
padding: 5px;
box-sizing: border-box;
background-color: #f0f0f0;
background-image: url('data:image/svg+xml,\
<svg xmlns="http://www.w3.org/2000/svg" \
width="170" height="29" \
fill="none" stroke="#999" stroke-width="1px"> \
<path d="M 1 1 L 169 1 L 169 19 L 82.5 29 L 1 19 z"></path> \
</svg>'
);
background-repeat: no-repeat;
}
сейчас так, но наверное надо
#menu2 a {
width: 170px;
height: 29px;
text-align: center;
display: inline-flex;
justify-content: center;
align-items: center;
margin: 0 0 2px;
padding: 5px;
box-sizing: border-box;
background-color: #f0f0f0;
background-image: url('data:image/svg+xml,\
<svg xmlns="http://www.w3.org/2000/svg" \
width="170" height="29" \
fill="none" stroke="#999" stroke-width="1px"> \
<path d="M 0 0 L 170 0 L 170 19 L 82.5 29 L 0 19 z"></path> \
</svg>'
);
background-repeat: no-repeat;
}