Lower from Tab

I want Contact slider a bit Down to the screen

I have added this code in child but no change
.wpcs-slide-out-div {
top: 90% !important;
}

and tried to Add Custom Code, this one also NO Change
div#wpcs_tab_7265 {
border: 1px solid #555555;
border-top: none;
cursor: pointer;
width: 170px;
height: 34px;
overflow: hidden;
background: #555555;
color: #ffffff;
padding: 2px 0px 2px 0px;
position: fixed;
bottom: 100px;
left: -68px;
}

And I want to resize the contact slider when it is open it cover the screen, I want to decrease the height of slider form
please as soon as possible find me a solution!
Thank You

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