设置根元素的字体为62.5%,1rem 等于10px;
html{
font-size:62.5%
}
Bottom1px {
width: 100%;
height: 10rem;
position: relative;
}
.Bottom1px:after {
content: '';
display: block;
position: absolute;
width: 100%;
left: 0; bottom: 0;
height: 1px;
background-color: #c8c7cc;
transform: scaleY(0.5);
}