#summSlider {
position: absolute;
transform-style: preserve-3d;
}
#summSlider::after {
width: 100%;
height: 6px;
background: url(/wp-content/uploads/2022/10/dashed.png) repeat-x;
content: "";
position: absolute;
display: inline-block;
right: 0;
left: 45px; // это значение надо менять
top: 3px;
bottom: 0;
margin: auto;
transform: translateZ(-1px);
}