amsmath label is not aligning to right end

[wzleong]

Adding equation in markdown with labels with referencing.
Below is the code.
$$
\begin{split}
x = y+z
\end{split}
$$ (eqn:coordinate)

The label unfortunately is generated as shown below at the left of the equation instead of aligning to right end.
This is generated with sphinx, sphinx_rtd_theme. The equations were also initially aligning to the right but have resolved it by adding the following custom css. Please advise if there is a way to update the label to align at the right
.math {
margin-left: auto !important;
margin-right: auto !important;
width: fit-content !important;
text-align: right !important;
}

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[IvolgaDmitriy]

@wzleong ,
I don't know how relevant it is, but this problem may be related to the theme used. For example readthedocs/sphinx_rtd_theme#383 .
My own style helped me (for sphinx-rtd-theme):

.eqno {
    margin-left: 5px;
    float: right;
}
.math .headerlink {
    display: none;
    visibility: hidden;
}
.math:hover .headerlink {
    display: inline-block;
    visibility: visible;
    margin-right: -0.7em;
}