How to add a border to a pseudo-element: before? - css

Question

Good afternoon, tell me please. I made up a block with a protruding corner on top of the block. On the whole block I have a corner that I made using box-shadow. How can I make exactly such a frame for a pseudo-element (.comment_text:before)
.comment{
margin-top: 20px;
padding: 0px 20px 0px 20px;
}
.comment_text{
max-width: 680px;
background-color: #f1fbff;
padding: 10px;
margin-top: 15px;
color: #FFF;
position: relative;
font-size: 12px;
line-height: 20px;
-webkit-box-shadow: 0px 0px 0px 1.5px #cfcfcf;
-moz-box-shadow: 0px 0px 0px 1.5px #cfcfcf;
box-shadow: 0px 0px 0px 1.5px #cfcfcf;
color: #333333;
font-size: 12pt;
font-family: Arial, sans-serif;
}
.comment_text:before {
content: "";
display: block;
border-bottom: 15px solid #f2fbff;
border-right: 20px solid transparent;
border-left: 0px solid transparent;
position: absolute;
top: -15px;
left: 22px;
}
<div v-for='comment in comments' class="comment">
<div class="comment_text">Some Text</div>
</div>

Answer 1

You can create another psudo element (::after) and make it litter bigger. Add the color similar to your Div border.
.comment{
margin-top: 20px;
padding: 0px 20px 0px 20px;
}
.comment_text{
max-width: 680px;
background-color: #f1fbff;
padding: 10px;
margin-top: 15px;
color: #FFF;
position: relative;
font-size: 12px;
line-height: 20px;
-webkit-box-shadow: 0px 0px 0px 1.5px #cfcfcf;
-moz-box-shadow: 0px 0px 0px 1.5px #cfcfcf;
box-shadow: 0px 0px 0px 1.5px #cfcfcf;
color: #333333;
font-size: 12pt;
font-family: Arial, sans-serif;
}
.comment_text:before {
content: "";
display: block;
border-bottom: 15px solid #cfcfcf;
border-right: 20px solid transparent;
border-left: 0px solid transparent;
position: absolute;
top: -15px;
left: 22px;
}
.comment_text:after {
content: "";
display: block;
border-bottom: 18px solid #f2fbff;
border-right: 20px solid transparent;
border-left: 0px solid transparent;
position: absolute;
top: -12px;
left: 24px;
}
<div v-for='comment in comments' class="comment">
<div class="comment_text">{{ comment.text }}</div>
</div>

Answer 2

Try adding Height and Width to it. and play with it until you have the desired effect.
You can also add a background to define what color you want it in
.comment_text:before {
content: "";
display: block;
border-bottom: 15px solid #f2fbff;
border-right: 20px solid transparent;
border-left: 15px solid transparent;
position: absolute;
top: -15px;
left: 2px;
height: 1px;
width: 10px;
background: blue;
}

Answer 3

.comment{
margin-top: 20px;
padding: 0px 20px 0px 20px;
}
.comment_text{
max-width: 680px;
background-color: #f1fbff;
padding: 10px;
margin-top: 15px;
color: #FFF;
position: relative;
font-size: 12px;
line-height: 20px;
-webkit-box-shadow: 0px 0px 0px 1.5px #cfcfcf;
-moz-box-shadow: 0px 0px 0px 1.5px #cfcfcf;
box-shadow: 0px 0px 0px 1.5px #cfcfcf;
color: #333333;
font-size: 12pt;
font-family: Arial, sans-serif;
}
.comment_text:before {
content: "";
display: block;
border-bottom: 15px solid #f2fbff;
border-right: 20px solid transparent;
border-left: 0px solid transparent;
position: absolute;
top: -15px;
left: 22px;
box-shadow: -2px 0px 0px -0.5px #cfcfcf;
}
.comment_text:after {
content: "";
display: block;
width: 23px;
height: 0px;
top: -8px;
left: 20px;
box-shadow: 0px 0px 0px 1px #cfcfcf;
transform: rotate(35deg);
position: absolute;
}