相关疑难解决方法(0)

#main_wrap{
    width:100%;
    border:solid 1px black;
    -moz-column-count: 3;
    -webkit-column-count: 3;
    column-count: 3;
}
#main_wrap > div{
    border-radius:5px;
    overflow:hidden;
    position:relative;
    -moz-column-break-inside: avoid;
    -webkit-column-break-inside: avoid;
    column-break-inside: avoid;
    width:70%;
    height:300px;
    border:solid 2px grey;
    margin:2px;
}
#main_wrap > div > div{
    position:absolute;
    background:red;
    border-radius:40px;
    width:40px;
    height:40px;
    right:-20px;
    top:0;
}

<div id="main_wrap">
    <div><div></div></div>
    <div><div></div></div>
    <div><div></div></div>
    <div><div></div></div>
    <div><div></div></div>
    <div><div></div></div>
    <div><div></div></div>
    <div><div></div></div>
    <div><div></div></div>
    <div><div></div></div>
</div>