Bootstrap 4，在两个卡片组之间增加空间

Question

我正试图在两个卡片组之间增加空间。我正在使用bootstrap 4 alpha 6.我不知道为什么在第二张卡牌上使用mt-20不会这样做。我已经尝试将它们包装成行并执行它，但是也没有这样做：

<div>
<div class="container">
            <div class="card-deck">
                <div class="card text-center">
                    <div class="card-block">
                        <h4 class="card-title">Permits</h4>
                        <p class="card-text">
                            Apply for parking permit<br />
                            View existing permit requests<br />
                            Activate Visitor permits<br />
                        </p>
                    </div>
                    <div class="card-footer">
                        @Html.ActionLink("Permits", "Index", "Home", new { Area = "Permit" }, new { @class = "btn btn-primary" })
                    </div>
                </div>

                <div class="card text-center">
                    <div class="card-block">
                        <h4 class="card-title">Vehicles</h4>
                        <p class="card-text">
                            View and manage your vehicles
                        </p>
                    </div>
                    <div class="card-footer">
                        @Html.ActionLink("My Vehicles", "Index", "Vehicle", null, new { @class = "btn btn-primary" })
                    </div>
                </div>

                <div class="card text-center">
                    <div class="card-block">
                        <h4 class="card-title">Parking Tickets</h4>
                        <p class="card-text">
                            View your parking ticket history
                        </p>
                    </div>
                    <div class="card-footer">
                        @Html.ActionLink("My Tickets", "Index", "ParkingTicket", null, new { @class = "btn btn-primary" })
                    </div>
                </div>
            </div>
    <div class="card-deck mt-20">
        <div class="card text-center">
            <div class="card-block">
                <h4 class="card-title">Funding Options</h4>
                <p class="card-text">
                    Add credit/debit card<br />
                    Top up Account<br />
                    Manage cards
                </p>
            </div>
            <div class="card-footer">
                @Html.ActionLink("Funding Options", "Index", "Funding", null, new { @class = "btn btn-primary" })
            </div>
        </div>

        <div class="card text-center">
            <div class="card-block">
                <h4 class="card-title">Account History</h4>
                <p class="card-text">
                    View all financial transactions on my account
                </p>
            </div>
            <div class="card-footer">
                @Html.ActionLink("Account transactions", "Index", "Activity", null, new { @class = "btn btn-primary" })
            </div>
        </div>
        <div class="card text-center">
            <div class="card-block">
                <h4 class="card-title">User Settings</h4>
                <p class="card-text">
                    Edit personal details<br />
                    Change top-up settings<br />
                    Change password
                </p>
            </div>
            <div class="card-footer">
                @Html.ActionLink("Personal details", "Update", "Account", null, new { @class = "btn btn-primary" })
            </div>
        </div>
    </div>
</div>

Answer 1

Bootstrap 4中没有mt-20.Bootstrap 4 margin classes是......

米{两侧} - {大小}

其中大小为0-5，大小是1rem默认间隔单元的一部分

• 0 - 消除保证金
• 1 - 将边距设为.25rem
• 2 - 将边距设为.5rem
• 3 - 设置边距为1rem
• 4 - 将边距设为1.5rem
• 5 - 设置边距为3rem

所以你可以使用mt-3，mt-4，mt-5等。

http://www.codeply.com/go/29IGJHkqVd

Answer 2

你可以在牌下放一个换行符：<br />。或者可以在card-deck类下添加一个底部边距：

.card-deck{
    bottom-margin: 10px;
}