当margin/padding取形式为百分比时，无论是left/right，还是top/bottom，都是以父元素的width为参照物的！
演示
375*100iphone6 高约等于宽的26.666666%1
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111html{font-size:100px;}
body{
margin:0;
padding:0;
}
.title{
font-size:.14rem;
}
.banner{
padding:.2rem;
}
.resizeable{
padding: 26.66666666666% 0 0;
position: relative;
}
.resizeable img{
position: absolute;
width: 100%; height: 100%;
left: 0; top: 0;
}
.top-list{
margin:0;
}
.top-list dl {
position: relative;
margin:0;
}
.top-list dl dt {
overflow: hidden;
padding: 66.1849710982659% 0 0;
position: relative;
}
.top-list dl dt img {
position: absolute;
width: 100%; height: 100%;
left: 0; top: 0;
object-fit: cover;
}
.top-list dl dd {
padding: .08rem;
font-size: .14rem;
color: #333333;
letter-spacing: 0;
line-height: .17rem;
}
.top-list dl dd .cont {
font-size: .12rem;
color: #FFFFFF;
line-height: .15rem;
overflow: hidden;
display: -webkit-box;
-webkit-line-clamp: 2;
line-clamp: 2;
text-overflow: ellipsis;
-webkit-box-orient: vertical;
box-orient: vertical;
font-weight: bold;
width: 90%;
}
.top-list dl dd .author {
font-size: 8px;
color: #FFFFFF;
}
.top-list dl .filtrate {
box-sizing: border-box;
margin:0;
position: absolute;
padding-top: .4rem;
padding-bottom: .06rem;
left: 0;
bottom: 0;
width: 100%;
background-image: linear-gradient(-180deg, transparent 0%, rgba(0, 0, 0, 0.56) 100%);
}
.top-list dl .date {
margin:0;
position: absolute;
width: .25rem;
height: .25rem;
text-align: center;
line-height: .25rem;
background: rgba(0, 0, 0, 0.3);
padding: 0;
color: #fff;
left: 0;
top: 0;
font-size: .1rem;
color: #FFFFFF;
}
.top-list{
padding:0;
}
.top-list li{
/*margin-top: .025rem;*/
padding-left: .24rem;
display: -webkit-box;
display: -webkit-flex;
display: flex;
}
.top-list li .box{
width:50%;
padding-left:.025rem;
padding-bottom:.025rem;
}
请在移动环境下访问，图片在iphone6(375*667为基准, 图片比例375*100)点击这里demo