这样的事情可能吗？
.background {
background-size: 50% cover;
}
更新：
希望您现在能更好地理解它。
即使一部分消失，图像也应保持成比例。
.background {
background-size: 50% cover;
}
.background {
border: 5px solid black;
width: 100%;
min-height: 400px;
background-image: url('http://placehold.it/350x150');
background-repeat: no-repeat;
background-position: top right;
background-size: 50% 100%;
}
.text {
padding: 10px;
width: 48%;
}
.center {
display: block;
text-align: center;
}
干杯
不，你不能，
这里是正规的语法的background-size 财产，
= [|auto]{1,2}|cover|contain
这意味着无论何时您都cover无法拥有length-percentage（这些代表|OR）
相反，您可以使用background-size: 50% 100%或background-size: auto 100%
更新根据您更新的问题，您可以使用所需的功能flexbox
div {
display: flex
}
div div:last-of-type {
background: url("http://lorempixel.com/400/200/") no-repeat center / cover;
}
div div {
flex: 1
}
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