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Hi Cyrille

What OS and What Sagemath notebook ?

look here

for me with Ubuntu 18.04 and Sagemath notebook 9.0 it is working with putting:

.output_png {
    display: table-cell;
    text-align: center;
    margin:auto;
}
.prompt 
    display:none;
}

at the end in my css file:./local/lib/python3.7/site-packages/notebook/static/custom/custom.css

like it is recommended in the link above.