#s6 .a-card img {
width: auto;
}
#s6 .a-card video {
width: auto;
}#s8 .a-card img {
width: auto;
}
#s8 .a-card video {
width: auto;
}
.a-card img {
width: 100%;
-o-object-fit: cover;
object-fit: cover;
-o-object-position: center;
object-position: center;
margin: 0 auto 24px;
}
.a-card video {
width: 100%;
-o-object-fit: cover;
object-fit: cover;
-o-object-position: center;
object-position: center;
margin: 0 auto 24px;
}
<div class="row">
<div class="col-xl-4 col-lg-4 col-md-4 col-sm-4">
<div class="a-card">
<video>
<source src="img/s5-1.webm">
</video>
<p>01</p>
<span></span>
</div>
</div>
<div class="col-xl-4 col-lg-4 col-md-4 col-sm-4">
<div class="a-card">
<img src="img/s5-2.gif" alt="">
<p>02</p>
<span></span>
</div>
</div>
<div class="col-xl-4 col-lg-4 col-md-4 col-sm-4">
<div class="a-card">
<img src="img/s5-3.gif" alt="">
<p>03</p>
<span></span>
</div>
</div>
</div>