Template:Windows message box/styles.css

.closable-window.NavFrame {
  border: 0;
  padding: 0;
  margin: 0;
  width: 480px;
  text-align: left;
}
.closable-window-popup.NavFrame {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.closable-window .NavContent {
  font-family: Tahoma;
  padding: 0;
  background:#C0C0C0;
  border-width:2px;
  border-color:#d2d2d2 #808080 #808080 #d2d2d2;
  border-style:solid;
}
.closable-window .NavHead {
  background: none;
  height: 0;
}
.closable-window-header {
  background: linear-gradient(90deg,navy,#1084d0);
  font-weight: bold;
  padding: 2px 4px;
  color: #fff;
  margin: 0;
}
.closable-window a.NavToggle {
  font-size: 0;
}
.closable-window a.NavToggleHide::after {
  content: "×";
  position:absolute;
  right: 1px;
  top: 4px;
  background:#C0C0C0;
  border-width:1px;
  border-color:#FFFFFF #808080 #808080 #FFFFFF;
  border-style:solid;
  color: #000;
  width: 20px;
  height: 19px;
  font-size:12px;
  font-weight:bold;
  font-family:Tahoma;
  text-align:center;
}
.closable-window a.NavToggleHide:active::before,
.closable-window a.NavToggleHide:active::after {
  border-color:#808080 #fff #fff #808080 !important;
}
.closable-window-content {
  padding: 10px 0 2px 0;
  display: flex;
  flex-flow: row nowrap;
  justify-content: start;
  align-items: center;
  column-gap: 0;
}
.closable-window-img {
  margin: 0 15px;
}
.closable-window-img img {
  max-width: 40px;
  height: auto;
}
.closable-window-text {
  text-align: left;
  max-width: 355px;
  line-height: 1.1rem;
}
.closable-window-btns {
  display: flex;
  flex-flow: row nowrap;
  justify-content: center;
  column-gap: 5px;
  margin: 0.5rem;
}
.closable-window-btns a {
  flex: none;
  padding: 0;
  display: inline-block;
  font-family: Tahoma;
  font-size: 0.8rem;
  width: 4rem;
  height: 1.5rem;
  outline:1px solid #000000;
  color: #000;
  background:#C0C0C0;
  border-width:1px;
  border-style:solid;
  border-color:#FFFFFF #808080 #808080 #FFFFFF;
  position:relative;
  text-decoration: none;
  text-align: center;
  vertical-align: middle;
}
.closable-window-btns a:active {
  border-color:#808080 #fff #fff #808080;
}