删除具有对角线边缘的CSS边框

问题描述

正如您在所附的屏幕截图中所见，我正在尝试删除边框中的对角线边缘。我该怎么办？

HTML：

<div class="container">
<div class="row mt-2">
<div class="col-3">
<div class="nav flex-column nav-pills" id="v-pills-tab" role="tablist" aria-orientation="vertical">
  <a class="nav-link active" id="v-pills-home-tab" data-toggle="pill" href="#v-pills-home" role="tab" aria-controls="v-pills-home" aria-selected="true">Home</a>
  <a class="nav-link" id="v-pills-profile-tab" data-toggle="pill" href="#v-pills-profile" role="tab" aria-controls="v-pills-profile" aria-selected="false">Profile</a>
  <a class="nav-link" id="v-pills-messages-tab" data-toggle="pill" href="#v-pills-messages" role="tab" aria-controls="v-pills-messages" aria-selected="false">About</a>
  <a class="nav-link" id="v-pills-settings-tab" data-toggle="pill" href="#v-pills-settings" role="tab" aria-controls="v-pills-settings" aria-selected="false">Settings</a>
</div>
</div>
<div class="col-9">
<div class="tab-content" id="v-pills-tabContent">
  <div class="tab-pane fade show active" id="v-pills-home" role="tabpanel" aria-labelledby="v-pills-home-tab">Yo</div>
  <div class="tab-pane fade" id="v-pills-profile" role="tabpanel" aria-labelledby="v-pills-profile-tab">...</div>
  <div class="tab-pane fade" id="v-pills-messages" role="tabpanel" aria-labelledby="v-pills-messages-tab">...</div>
  <div class="tab-pane fade" id="v-pills-settings" role="tabpanel" aria-labelledby="v-pills-settings-tab">...</div>
</div>
</div>
</div>
</div>

CSS

.nav {
    border-radius: 4px;
    border: solid 1px #dddddd;
    background-color: #ffffff;
    height: 100%;
    min-height: calc(100vh - 200px);
}
.nav-pills .nav-link {
    border-radius: 0;
}
.nav-pills .nav-link.active,.nav-pills .show>.nav-link {
  color: #333;
  background-color: #e6f8fd;
  border-right: 4px solid #00b0e6;
  border-radius: 0px;
  font-weight: 600;
}
.nav-link {
  border-bottom: 1px solid #ddd;
  border-radius: 0;
  color: #333;
}
.nav.flex-column a:first-child,.nav.flex-column a:first-child:hover {
  border-top-right-radius: 3px !important;
  border-top-left-radius: 3px !important;
}
.nav-link:hover {
  color: #333;
  background-color: #e6f8fd;
  border-radius: 0px !important;
  border-right: 4px solid #00b0e6;
}

解决方法

问题是因为您同时具有border-right和border-bottom，请查看跟随代码段中border的行为。

.container {
  height: 100px;
  width: 100px;
  background-color: transparent;
  border-top: 20px green solid;
  border-right: 20px orange solid;
  border-bottom: 20px silver solid;
  border-left: 20px red solid;
}

<div class="container">

</div>

如果不希望使用对角线，则应删除边框底部的对角线，而可以使用边框顶部来分隔选项卡。

.nav .nav-link {
   border-bottom: 0px !important;
 }

 .nav .nav-link {
   border-top: 1px #dddddd solid;
 }

在每个标签之间留出空格：

您还可以同时删除border-top和border-bottom，使用margin / top / bottom作为子项，然后将背景色添加到父容器中。

bootstrap-4 twitter-bootstrap