CSS 三条横线等分

.header_qian {
width: 1.5rem;
height: 1.5rem;
background: rgba(250, 250, 250,0.7);
border-radius: 50%;
display: inline-block;
position: relative;
}

.header_qian i {
width: 0.8rem;
height: 0.11rem;
border-top: 0.12rem solid #a7a6a6;
border-bottom: 0.12rem solid #a7a6a6;
background-color: #a7a6a6;
padding: 0.12rem 0;
background-clip: content-box;
display: block;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
}