Unsupported css in Layout data

Hi,
For a few weeks, the css codes that I add in the parameters of my Layouts are no longer applied, whereas it worked perfectly before.
Here are the codes:

.title {
	font-size:1em;
	padding-left:6px;
	padding-right:6px;
}

.post_date {
	padding-left:6px;
	padding-right:6px;
	padding-bottom:6px;
	font-size:1.1em;
	font-style:italic;
	color:#000000;
	border-bottom: 1px solid #02033C;
	margin-bottom:5px;

}
.post_date::before {
	content:"[";
}
.post_date::after {
	content:"]";
}
.categories {
	padding-left:6px;
	padding-right:6px;
	font-size:1.1em;
}
.excerpt {
	padding-left:6px;
	padding-right:6px;
	font-style:italic;
	font-size:.9em;
}
.excerpt::after {
	content: " [...]";
}

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