Tableau

Bonjour,
J'ai fait un tableau (dont le code est ci-dessous) mais il est horrible... J'aimerai savoir si c'est possible de le rendre plus joli? Si oui, comment?
Je pensais peut être faire en sorte que les cases occupent toutes la largueur (qu'il y ait 1 ou 9 données)


<table border=1 width=70% align="center" cellspacing=0 cellpadding=1 id="1">
<tr><th>Mars 2019:</th><th>/</th></tr>

<tr><th>Février 2019:</th><th>/</th></tr>

<tr><th>Janvier 2019:</th><th>/</th></tr>

<tr><th>Décembre 2018:</th><th><a href="1218001.html">1218001</a></th><th><a href="1218002.html">1218002</a></th><th><a href="1218003.html">1218003</a></th><th><a href="1218004.html">1218004</a></th></tr>

<tr><th>Novembre 2018:</th><th><a href="1118001.html">1118001</a></th><th><a href="1118002.html">1118002</a></th><th><a href="1118003.html">1118003</a></th><th><a href="1118004.html">1118004</a></th><th><a href="1118005.html">1118005</a></th><th><a href="1118006.html">1118006</a></th><th><a href="1118007.html">1118007</a></th><th><a href="1118008.html">1118008</a></th><th><a href="1118009.html">1118009</a></th></tr>

<tr><th>Octobre 2018:</th><th><a href="1018001.html">1018001</a></th><th><a href="1018002.html">1018002</a></th></tr>

<tr><th>Septembre 2018:</th><th><a href="0918001.html">0918001</a></th><th><a href="0918002.html">0918002</a></th><th><a href="0918003.html">0918003</a></th><th><a href="0918004.html">0918004</a></th></tr>

<tr><th>Aout 2018:</th><th><a href="0818001.html">0818001</a></th><th><a href="0818002.html">0818002</a></th></tr>

<tr><th>Juillet 2018:</th><th><a href="0718001.html">0718001</a></th><th><a href="0718002.html">0718002</a></th><th><a href="0718003.html">0718003</a></th><th><a href="0718004.html">0718004</a></th><th><a href="0718005">0718005</a></th></tr>

<tr><th>Juin 2018:</th><th><a href="0618001.html">0618001</a></th><th><a href="0618002.html">0618002</a></th><th><a href="0618003.html">0618003</a></th></tr>

<tr><th>Mai 2018:</th><th><a href="0518001.html">0518001</a></th><th><a href="0518002.html">0518002</a></th><th><a href="0518003.html">0518003</a></th><th><a href="0518004.html">0518004</a></th><th><a href="0518005">0518005</a></th></tr>
</table>