You need two rules:
max-widthfor your elements .card(because without determining the width, CSS will not know where to break your long word) or overflow: hidden; so that the width .cardno longer depends on the length of the long wordword-wrap: break-word;to tell the browser to break the word
.card {
max-width: 100%;
}
.card-text {
word-wrap: break-word;
}
.card {
overflow: hidden;
}
.card-block {
word-wrap: break-word;
}
<link data-require="bootstrap@4.0.0-alpha.6" data-semver="4.0.0-alpha.6" rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" />
<div class="card-deck">
<div class="card">
<div class="card-block">
<h4 class="card-title">Card title</h4>
<p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small>
</p>
</div>
</div>
<div class="card">
<div class="card-block">
<h4 class="card-title">Card title</h4>
<p class="card-text">This card has supporting text below as a natural lead-in to additional content.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small>
</p>
</div>
</div>
<div class="card">
<div class="card-block">
<h4 class="card-title">Card title</h4>
<p class="card-text">supportingsupportingsupportingsupportingsupportingsupportingsupportingsupportingsupportingsupportingsupportingsupportingsupportingsupportingsupportingsupportingsupportingsupportingto additional content. This card has even longer content than the
first to show that equal height action.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small>
</p>
</div>
</div>
</div>
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