如何使动画相对于父元素而不是主体移动？

Question

我想在我的主页中使用this css 动画作为部分。

body{
    margin: 0;
    padding: 0;
    overflow: hidden;
}

.flower-section{
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(#333, #000);
}

.set{
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 1;
}

.set div{
    position: absolute;
    display: block;
}

.set div img{
    background-color: red;
    padding: 1rem;
}

.set div:nth-child(1){
    left: 5%;
    animation: animate 15s linear infinite;
    animation-delay: -7s;
}
.set div:nth-child(2){
    left: 15%;
    animation: animate 20s linear infinite;
    animation-delay: -5s;
}
.set div:nth-child(3){
    left: 25%;
    animation: animate 25s linear infinite;
}
.set div:nth-child(4){
    left: 35%;
    animation: animate 15s linear infinite;
}
.set div:nth-child(5){
    left: 50%;
    animation: animate 18s linear infinite;
    animation-delay: -10s;
}
.set div:nth-child(6){
    left: 65%;
    animation: animate 12s linear infinite;
    animation-delay: -8s;
}
.set div:nth-child(7){
    left: 75%;
    animation: animate 14s linear infinite;
}
.set div:nth-child(8){
    left: 85%;
    animation: animate 15s linear infinite;
    animation-delay: -7s;
}
.set div:nth-child(9){
    left: 95%;
    animation: animate 19s linear infinite;
}

@keyframes animate{
    0%{
        top: -10%;
        opacity: 0;
        transform: translateX(20px) rotate(0deg);
    }
    10%{
        opacity: 1;
    }
    20%{
        transform: translateX(-20px) rotate(45deg);
    }
    40%{
        transform: translateX(-20px) rotate(90deg);
    }
    60%{
        transform: translateX(20px) rotate(135deg);
    }
    80%{
        transform: translateX(-20px) rotate(180deg);
    }
    100%{
        top:110%;
        transform: translateX(-20px) rotate(225deg);
    }
}

.set2{
    transform: scale(1.5) rotateY(180deg);
    filter: blur(2px);
    z-index: 0;
}

.set3{
    transform: scale(0.8) rotateX(180deg);
    filter: blur(4px);
    z-index: 0;
}

.flower-title{
    position: absolute;
    top: 50%;
    transform: translateY(-50% );
    width: 100%;
    text-align: center;
    color: #fff;
    margin: 0;
    padding: 0;
    font-size: 5em;
    font-family: sans-serif;
    z-index: 1;
}

但是当我尝试实现它时，this 发生了。

红色方块似乎相对于整个身体而不是父容器移动。我该如何解决？ 我已经尝试过让父母和孩子的位置相对，但似乎没有用。

Answer 1

红色方块到处漂浮的原因是您将容器元素设置为position: relative;，但从未将任何方块设置为position: absolute;。通过将方块设置为绝对位置，您在它们上所做的一切现在都将相对于它们的容器。

我所做的是将所有.set div:nth-child(n) 设置为position: absolute;。然后我去给main 一个白色的背景，这样红色的方块就可以落后了。我还给了nav 一个相对位置，这样我就可以给它一个比红色方块更高的 z-index，所以方块从导航后面而不是前面开始。

我还将容器的高度设置为 600px 的固定高度，因为以 % 为单位的高度是一个相对单位，因此结果高度取决于父元素的高度。

以下是我实现您想要的结果的方法：

body{
    margin: 0;
    padding: 0;
}

main {
  background: white;
}

nav {
  position: relative;
  z-index: 99;
}

.flower-section{
    position: relative;
    height: 600px;
    background: radial-gradient(#333, #000);
    /* overflow: hidden; */
}

.set{
    position: relative;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    /* z-index: 1; */
}

.set div{
    position: relative;
    display: block;
}
.set div img{
    background-color: red;
    padding: 1rem;
}

.set div:nth-child(1){
    position: absolute;
    left: 5%;
    animation: animate 15s linear infinite;
    animation-delay: -7s;
}
.set div:nth-child(2){
    position: absolute;
    left: 15%;
    animation: animate 20s linear infinite;
    animation-delay: -5s;
}
.set div:nth-child(3){
    position: absolute;
    left: 25%;
    animation: animate 25s linear infinite;
}
.set div:nth-child(4){
    position: absolute;
    left: 35%;
    animation: animate 15s linear infinite;
}
.set div:nth-child(5){
    position: absolute;
    left: 50%;
    animation: animate 18s linear infinite;
    animation-delay: -10s;
}
.set div:nth-child(6){
    position: absolute;
    left: 65%;
    animation: animate 12s linear infinite;
    animation-delay: -8s;
}
.set div:nth-child(7){
    position: absolute;
    left: 75%;
    animation: animate 14s linear infinite;
}
.set div:nth-child(8){
    position: absolute;
    left: 85%;
    animation: animate 15s linear infinite;
    animation-delay: -7s;
}
.set div:nth-child(9){
    position: absolute;
    left: 95%;
    animation: animate 19s linear infinite;
}

@keyframes animate{
    0%{
        top: -10%;
        opacity: 0;
        transform: translateX(20px) rotate(0deg);
    }
    10%{
        opacity: 1;
    }
    20%{
        transform: translateX(-20px) rotate(45deg);
    }
    40%{
        transform: translateX(-20px) rotate(90deg);
    }
    60%{
        transform: translateX(20px) rotate(135deg);
    }
    80%{
        transform: translateX(-20px) rotate(180deg);
    }
    100%{
        top:110%;
        transform: translateX(-20px) rotate(225deg);
    }
}

.set2{
    position: absolute;
    transform: scale(1.5) rotateY(180deg);
    filter: blur(2px);
    /* z-index: 0; */
}

.set3{
    position: absolute;
    transform: scale(0.8) rotateX(180deg);
    filter: blur(4px);
    /* z-index: 0; */
}

.flower-title{
    position: absolute;
    top: 50%;
    transform: translateY(-50% );
    width: 100%;
    text-align: center;
    color: #fff;
    margin: 0;
    padding: 0;
    font-size: 5em;
    font-family: sans-serif;
    /* z-index: 1; */
}