update hover formatting to match zeplin

[emillipede]

current hover	zeplin hover

we also need to address the circlemarker formatting/shadowing/size, please see #191

CSS from zeplin:

Rectangle {
width: 109px;
height: 35px;
border-radius: 4px;
background-color: #000000;
}

Hover {
font-family: Lato;
font-size: 12px;
font-weight: normal;
font-style: normal;
font-stretch: normal;
line-height: normal;
letter-spacing: normal;
color: #ffffff;
}