My user styles for Gmail

gmail.css

/* Hide the ads */
.mq,
.oM,
.u7,
.V3vJRb,
.yxEQwb { display: none; }

/* Un-comment to hide the footer */
.l2 { display: none; }

/* Larger message font */
.ii {
  font-size: 14px;
  line-height: 1.5;
}

/* max-width for message body */
.hx .ii {
  max-width: 700px;
}

/* message list */
.F  td {
  font-size: 14px;
}

/* compose box */
.editable {
 font-size: 14px;
 line-height: 1.4;
}

.Zs {
  display: none;
}

/* header cleanup */
.gb_5b {
  background-color: #f4f4f4;
}

.gb_na .gb_la,
#gbwa,
.gb_ea {
  display: none;
}

.gb_I { /* avatar */
  display: block;
  float: right;
}

/* people list as 3rd column */
.Bu.y3 {
  display: none;
}


/* labels in message list */
.ar.as {
  display: none;
}

/* make main content take full width */
.if {
  margin-right: 0;
}

.nH.hx {
  padding-right: 0;
}

/* no gray bg for read messages */
.yO {
  background: none;
  color: #555;
}

/* lighter highlight color */
.x7 {
  background: #ffffe7; 
}

/* lighter bottom borders on message list */
.xY {
  border-bottom-color: #e9e9e9;
}

/* hide quick link buttons in message list */
.aKS {
  display: none;
}

.a4X {
  padding-right: 0 !important;
}

/* right side links to labels */
.aze,
.zw {
  display: none;
}

Add screencap?

I second the request for a screencap 😉.