body {
    padding: 0;
    margin: 0;
    font-size: 14px;
}

.container {
    line-height: 50px;
}

#modal-V1-shadow {
    /*set default modal status is hide*/
    display: none;

    /*实现一层蒙版的效果 加上浅灰的背景色*/
    z-index: 10;
    background-color: rgba(0, 0, 0, 0.4);
    position: fixed; /*此处使用fixed 而不是absolute 是因为fixed是相对于视口viewpoint定位的*/
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
}

.modal-V1-wrapper {
    /*高度固定，宽度固定*/
    width: 320px;
    height: 400px;

    margin: 20px auto 20px;

    text-align: center; /*文字居中*/
    overflow: auto; /*文字超出modal高度后设置为滑动状态*/
    background-color: darkorange;

    border-radius: 6px;
}

.modal-V1-content {
    padding: 10px;
}

#modal-V2-shadow {
    /*set default modal status is hide*/
    display: none;
    overflow-x: hidden;
    overflow-y: auto;
    z-index: 10;

    height: 100%;
    width: 100%;

    /*实现一层蒙版的效果 加上浅灰的背景色*/
    position: fixed;
    background-color: rgba(0, 0, 0, 0.4);
    left: 0;
    top: 0;

    align-items: flex-start;
    justify-content: center;
}

.modal-V2-wrapper {
    width: auto;
    background-color: darkorange;
    margin: 36px 8px;
    border-radius: 6px;
}

.modal-V2-content {
    padding: 10px;
}

#modal-V3-shadow {
    /*set default modal status is hide*/
    display: none;
    overflow-x: hidden;
    overflow-y: auto;
    z-index: 10;

    /*实现一层蒙版的效果 加上浅灰的背景色*/
    position: fixed;
    background-color: rgba(0, 0, 0, 0.4);
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
}

.modal-V3-wrapper {
    max-width: 500px;
    background-color: darkorange;
    margin: 1.75rem auto;
    border-radius: 6px;
    transform: translate(0, 0);
}

.modal-V3-content {
    padding: 10px;
}

#modal-V4-shadow {
    /*set default modal status is hide*/
    display: none;
    z-index: 10;
    overflow-x: hidden;
    overflow-y: auto;

    /*实现一层蒙版的效果 加上浅灰的背景色*/
    position: fixed;
    background-color: rgba(0, 0, 0, 0.4);
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
}

.modal-V4-wrapper {
    display: flex;
    align-items: center;

    margin: 1.75rem auto;
    max-width: 500px;
    min-height: calc(100% - (1.75rem * 2));

    transform: translate(0, 0);
    transition: transform .3s ease-out;
}

.modal-V4-content {
    background-color: darkorange;
    width: 100%;

    border-radius: 6px;
}

#modal-V5-shadow {
    /*set default modal status is hide*/
    display: none;
    z-index: 10;
    overflow-x: hidden;
    overflow-y: auto;

    /*实现一层蒙版的效果 加上浅灰的背景色*/
    position: fixed;
    background-color: rgba(0, 0, 0, 0.4);
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;

    /*设置modal位置居中*/
    align-items: center;
    justify-content: center;

    padding: 15px;
}

.modal-V5-wrapper {
    width: 100%;
}

@media (min-width: 768px) {
    .modal-V5-wrapper {
       width: 450px;
    }
}

.modal-V5-content {
    padding: 10px;
    background-color: darkorange;
    border-radius: 6px;
}


#modal-V6-overlay {
    /*set default modal status is hide*/
    display: none;
    z-index: 10;
    overflow: auto;

    /*实现一层蒙版的效果 加上浅灰的背景色*/
    position: fixed;
    background-color: rgba(0, 0, 0, 0.4);
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;

    /*设置modal位置居中*/
    align-items: center;
    justify-content: center;

    -webkit-overflow-scrolling: touch; /*iOS 平滑滚动 */
    padding: 15px;
}

@media (min-width: 768px) {
    .modal-V6-overlay {
       width: 450px;
    }
}

.modal-V6-content {
    padding: 10px;
    background-color: darkorange;
    border-radius: 6px;
    margin: auto 0;  /*实现增加顶部的空间 */
}