<div style="
/* Content is centered horizontally */
align-items: center;
display: flex;
/* Used to set the position of text */
position: relative;
">
<div style="
/* We won't see the separator line */
background: #FFF;
/* Displayed at the center of container */
left: 50%;
position: absolute;
top: 50%;
transform: translate(-50%, -50%);
">
...
</div>
<div style="
border-bottom: 1px solid rgba(0, 0, 0, 0.3);
height: 1px;
width: 100%;
" />
</div>