如何为元素设置动画以使其从页面顶部滑入。元素在带有网格的页面中居中

Question

https://codesandbox.io/s/github/Critter4Dinner/Calculator

如何使用网格设置垂直和水平居中的组件动画，如何设置它从页面顶部滑入的动画？

在我的 index.css 文件中，这是我目前所拥有的..

html, body, #root, #root>div {
    height: 100%;
    margin: 0;
    display: grid;
    background-color: #330055;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 1000'%3E%3Cg %3E%3Ccircle fill='%23330055' cx='50' cy='0' r='50'/%3E%3Cg fill='%2338005b' %3E%3Ccircle cx='0' cy='50' r='50'/%3E%3Ccircle cx='100' cy='50' r='50'/%3E%3C/g%3E%3Ccircle fill='%233e0160' cx='50' cy='100' r='50'/%3E%3Cg fill='%23430166' %3E%3Ccircle cx='0' cy='150' r='50'/%3E%3Ccircle cx='100' cy='150' r='50'/%3E%3C/g%3E%3Ccircle fill='%2349026c' cx='50' cy='200' r='50'/%3E%3Cg fill='%234e0272' %3E%3Ccircle cx='0' cy='250' r='50'/%3E%3Ccircle cx='100' cy='250' r='50'/%3E%3C/g%3E%3Ccircle fill='%23540377' cx='50' cy='300' r='50'/%3E%3Cg fill='%235a037d' %3E%3Ccircle cx='0' cy='350' r='50'/%3E%3Ccircle cx='100' cy='350' r='50'/%3E%3C/g%3E%3Ccircle fill='%23600483' cx='50' cy='400' r='50'/%3E%3Cg fill='%23660489' %3E%3Ccircle cx='0' cy='450' r='50'/%3E%3Ccircle cx='100' cy='450' r='50'/%3E%3C/g%3E%3Ccircle fill='%236c048f' cx='50' cy='500' r='50'/%3E%3Cg fill='%23720595' %3E%3Ccircle cx='0' cy='550' r='50'/%3E%3Ccircle cx='100' cy='550' r='50'/%3E%3C/g%3E%3Ccircle fill='%2379059a' cx='50' cy='600' r='50'/%3E%3Cg fill='%237f05a0' %3E%3Ccircle cx='0' cy='650' r='50'/%3E%3Ccircle cx='100' cy='650' r='50'/%3E%3C/g%3E%3Ccircle fill='%238605a6' cx='50' cy='700' r='50'/%3E%3Cg fill='%238c04ac' %3E%3Ccircle cx='0' cy='750' r='50'/%3E%3Ccircle cx='100' cy='750' r='50'/%3E%3C/g%3E%3Ccircle fill='%239304b2' cx='50' cy='800' r='50'/%3E%3Cg fill='%239a03b8' %3E%3Ccircle cx='0' cy='850' r='50'/%3E%3Ccircle cx='100' cy='850' r='50'/%3E%3C/g%3E%3Ccircle fill='%23a103bd' cx='50' cy='900' r='50'/%3E%3Cg fill='%23a801c3' %3E%3Ccircle cx='0' cy='950' r='50'/%3E%3Ccircle cx='100' cy='950' r='50'/%3E%3C/g%3E%3Ccircle fill='%23af00c9' cx='50' cy='1000' r='50'/%3E%3C/g%3E%3C/svg%3E");
    background-attachment: fixed;
    background-size: contain;

    animation-name: slideFromTop;
    animation-iteration-count: 1;
    animation-duration: 400ms;
  }


  @keyframes slideFromTop {
    0% {
        height: 0%;
    }
    100% {
        height: 100%;
    }
}

这会获取要滑入的元素，但它不是来自页面之外。我试过使用负百分比但它似乎没有用。

Answer 1

您可以使用 postion:relative 或 translate()。

position:relative 示例：

html, body, #root, #root>div {
    height: 100%;
    margin: 0;
    display: grid;
    background-color: #330055;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 1000'%3E%3Cg %3E%3Ccircle fill='%23330055' cx='50' cy='0' r='50'/%3E%3Cg fill='%2338005b' %3E%3Ccircle cx='0' cy='50' r='50'/%3E%3Ccircle cx='100' cy='50' r='50'/%3E%3C/g%3E%3Ccircle fill='%233e0160' cx='50' cy='100' r='50'/%3E%3Cg fill='%23430166' %3E%3Ccircle cx='0' cy='150' r='50'/%3E%3Ccircle cx='100' cy='150' r='50'/%3E%3C/g%3E%3Ccircle fill='%2349026c' cx='50' cy='200' r='50'/%3E%3Cg fill='%234e0272' %3E%3Ccircle cx='0' cy='250' r='50'/%3E%3Ccircle cx='100' cy='250' r='50'/%3E%3C/g%3E%3Ccircle fill='%23540377' cx='50' cy='300' r='50'/%3E%3Cg fill='%235a037d' %3E%3Ccircle cx='0' cy='350' r='50'/%3E%3Ccircle cx='100' cy='350' r='50'/%3E%3C/g%3E%3Ccircle fill='%23600483' cx='50' cy='400' r='50'/%3E%3Cg fill='%23660489' %3E%3Ccircle cx='0' cy='450' r='50'/%3E%3Ccircle cx='100' cy='450' r='50'/%3E%3C/g%3E%3Ccircle fill='%236c048f' cx='50' cy='500' r='50'/%3E%3Cg fill='%23720595' %3E%3Ccircle cx='0' cy='550' r='50'/%3E%3Ccircle cx='100' cy='550' r='50'/%3E%3C/g%3E%3Ccircle fill='%2379059a' cx='50' cy='600' r='50'/%3E%3Cg fill='%237f05a0' %3E%3Ccircle cx='0' cy='650' r='50'/%3E%3Ccircle cx='100' cy='650' r='50'/%3E%3C/g%3E%3Ccircle fill='%238605a6' cx='50' cy='700' r='50'/%3E%3Cg fill='%238c04ac' %3E%3Ccircle cx='0' cy='750' r='50'/%3E%3Ccircle cx='100' cy='750' r='50'/%3E%3C/g%3E%3Ccircle fill='%239304b2' cx='50' cy='800' r='50'/%3E%3Cg fill='%239a03b8' %3E%3Ccircle cx='0' cy='850' r='50'/%3E%3Ccircle cx='100' cy='850' r='50'/%3E%3C/g%3E%3Ccircle fill='%23a103bd' cx='50' cy='900' r='50'/%3E%3Cg fill='%23a801c3' %3E%3Ccircle cx='0' cy='950' r='50'/%3E%3Ccircle cx='100' cy='950' r='50'/%3E%3C/g%3E%3Ccircle fill='%23af00c9' cx='50' cy='1000' r='50'/%3E%3C/g%3E%3C/svg%3E");
    background-attachment: fixed;
    background-size: contain;
    position:relative;
    animation-name: slideFromTop;
    animation-iteration-count: 1;
    animation-duration: 400ms;
  }


  @keyframes slideFromTop {
    0% {
       top: -100vh;
    }
    100% {
        top: 0;
    }
}

https://codesandbox.io/s/exciting-star-c4e68

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