hr {
border: 0;
border-color:blue;
background-color:blue;
color:blue;
height: 4px;
background:#fff;
background: -webkit-gradient(linear, left top, right top, color-stop(0%,hsla(0,0%,0%,0)), color-stop(50%,hsla(0,0%,0%,.75)), color-stop(100%,hsla(0,0%,0%,0)));
background: -webkit-linear-gradient(left, hsla(0,0%,0%,.75) 10%, hsla(0,0%,0%,0) 100%);
background: -moz-linear-gradient(left, hsla(0,0%,0%,.75) 10%, hsla(0,0%,0%,0) 100%);
background: -ms-linear-gradient(left, hsla(0,0%,0%,.75) 10%, hsla(0,0%,0%,0) 100%);
background: -o-linear-gradient(left, hsla(0,0%,0%,.75) 10%, hsla(0,0%,0%,0) 100%);
background: linear-gradient(left, hsla(0,0%,0%,.75) 10%, hsla(0,0%,0%,0) 100%);
}
我希望将 hr 的颜色更改为蓝色。显然,颜色、背景颜色设置不起作用,我该怎么做?