flex与应用

主轴与交叉轴（主轴默认水平方向）
justify与aligin:延主轴方向与垂直主轴方向对齐（start、center、end）
实现行末省略
实现骰子

flex 布局的基本概念 - CSS：层叠样式表 | MDNMDN Web Docs

实现骰子

css部分

.first-face {
    display: flex;
    /*水平方向*/
    justify-content: center;
    /*垂直方向*/
    align-items: center;
}

.second-face {
    display: flex;
    /*在容器中均匀分布*/
    justify-content: space-between;

}

.second-face .pip:nth-child(2) {
    /*垂直靠下*/
    align-self: flex-end;
}

.third-face {
    display: flex;
    justify-content: space-between;

}

.third-face .pip:nth-child(2) {
    align-self: center;
}

.third-face .pip:nth-child(3) {
    align-self: flex-end;
}


.four-face,
.fifth-face,
.six-face {
    display: flex;
    justify-content: space-between;
}

.four-face .col,
.fifth-face .col,
.six-face .col {
    display: flex;
    /*项目在垂直方向上排列*/
    flex-direction: column;
    justify-content: space-between;
}

.fifth-face .col:nth-child(2) {
    align-self: center;
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}


body {
    justify-content: center;
    align-items: center;

    background-color: green;
}

[class$="face"] {
    width: 104px;
    height: 104px;
    border-radius: 10px;
    margin: 16px;
    padding: 8px;

    background-color: #e7e7e7;

    box-shadow: inset 0 5px #fff,
        inset 0 -5px #bbb,
        inset 5px 0 #d7d7d7,
        inset -5px 0 #d7d7d7;
}

.pip {
    width: 24px;
    height: 24px;
    border-radius: 50%;

    background-color: #333;

    box-shadow: inset 0 3px #111, inset 0 -3px #555;
}

html部分：

<!DOCTYPE html>

<head>
    <link rel="stylesheet" href="index.css">

</head>

<body>
    <div class="first-face">
        <div class="pip"></div>
    </div>
    <div class="second-face">
        <div class="pip"></div>
        <div class="pip"></div>
    </div>

    <div class="third-face">
        <div class="pip"></div>
        <div class="pip"></div>
        <div class="pip"></div>
    </div>

    <div class="four-face">
        <div class="col">
            <div class="pip"></div>
            <div class="pip"></div>
        </div>
        <div class="col">
            <div class="pip"></div>
            <div class="pip"></div>
        </div>
    </div>

    <div class="fifth-face">
        <div class="col">
            <div class="pip"></div>
            <div class="pip"></div>
        </div>
        <div class="col">
            <div class="pip"></div>
        </div>
        <div class="col">
            <div class="pip"></div>
            <div class="pip"></div>
        </div>
    </div>

    <div class="six-face">
        <div class="col">
            <div class="pip"></div>
            <div class="pip"></div>
            <div class="pip"></div>
        </div>
        <div class="col">
            <div class="pip"></div>
            <div class="pip"></div>
            <div class="pip"></div>
        </div>
    </div>
</body>

实现效果：

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