div左右居中css

l_btn{
font-size: 1.2rem;
190px;
height: 50px;
border: 1px solid #fff;
border-radius: 25px;
color: #fff;
display: flex;
margin-top: 95px;
position: absolute;
left: 50%;
right: 50%;
transform: translate(-50%,-50%);
}