samples/web_embedding/element_embedding_demo/web/css/style.css

@font-face {
  font-family: "DM Sans";
  src: url(../fonts/DMSans-Regular.ttf);
  font-weight: normal;
}

@font-face {
  font-family: "DM Sans";
  src: url(../fonts/DMSans-Bold.ttf);
  font-weight: 700;
}

/** Reset */
* {
  box-sizing: border-box;
  font-family: "DM Sans", sans-serif;
}
html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
}

body {
  background-color: #fff;
  background-image: radial-gradient(
      ellipse at bottom,
      #fafafa 5%,
      transparent 60%
    ),
    linear-gradient(136deg, transparent, #eee 290%),
    linear-gradient(115deg, #fafafa, transparent 40%),
    linear-gradient(180deg, transparent 0, #ddd 70%),
    radial-gradient(ellipse at -70% -180%, transparent 80%, #eee 0),
    radial-gradient(ellipse at bottom, #71c7ee 40%, transparent 80%),
    radial-gradient(ellipse at 5% 340%, transparent 80%, #ddd 0);
  background-repeat: no-repeat;
  color: #555;
}

/** Layout **/
body { display: flex; flex-direction: column; }
section.contents {
  flex: 1 1 auto;
  flex-direction: row;
  display: flex;
}
section.contents aside {
  flex: 0;
  display: flex;
  flex-direction: column;
  order: -1;
}
section.contents aside fieldset {
  display: flex;
  flex-flow: wrap;
  justify-content: space-between;
  align-items: flex-end;
}
section.contents aside .align-top {
  align-self: flex-start;
}
section.contents article {
  flex: 1;
  margin-top: 50px;
  display: flex;
  justify-content: center;
}

/** Title */
h1 {
  font-weight: 700;
  font-size: 48px;
  padding: 0;
  line-height: .9em;
  letter-spacing: -2px;
  margin: 0 0 30px 0;
}

/** Controls for the demo (left column) */
#demo_controls {
  background: linear-gradient(90deg, rgba(255,255,255,1) 10%, rgba(255,255,255,0) 100%);
  padding: 40px 20px 0px 20px;
  z-index: 10;
}
#demo_controls fieldset {
  padding: 0;
  border: none;
  width: 210px;
}
#demo_controls legend {
  text-align: center;
  font-size: 20px;
  line-height: 40px;
  margin-bottom: 3px;
}
#demo_controls select.screen {
  display: block;
  width: 120px;
  padding: 4px;
  text-align: center;
  margin-bottom: 10px;
}
#demo_controls input {
  display: block;
  width: 100px;
  margin: 0 0 10px 0;
  text-align: center;
}
/** Keep controls that  */
#demo_controls .tight input {
  margin: 0px;
}
#demo_controls input[type="button"] {
  line-height: 10px;
  font-size: 14px;
  border-radius: 15px;
  border: 1px solid #aaa;
  border-style: outset;
  background-color: #fff;
  height: 30px;
  color: #555;
  transition: all 100ms ease-in-out;
  cursor: pointer;
}
#demo_controls input[type="button"]:hover {
  /* .active:hover background-color: #96B6E3;*/
  border-color: #1c68d4;
  background-color: #1c68d4;
  color: white;
}
#demo_controls input[type="button"].active {
  border-color: #1c68d4;
  background-color: #1c68d4;
  color: white;
}
#demo_controls input#value {
  font-size: 32px;
  line-height: 1em;
  min-height: 30px;
  color: #888;
}
#demo_controls input#increment {
  /* Center vertically next to taller input#value */
  position: relative;
  top: -6px;
}
#demo_controls .disabled {
  pointer-events: none;
  opacity: .5;
}

/** The style for the DIV where flutter will be rendered, and the CSS fx */
#flutter_target {
  border: 1px solid #aaa;
  width: 320px;
  height: 480px;
  border-radius: 0px;
  transition: all 150ms ease-in;
}
#flutter_target.resize {
  width: 480px;
  height: 320px;
}
#flutter_target.spin { animation: spin 6400ms ease-in-out infinite; }
#flutter_target.shadow { position: relative; }
#flutter_target.shadow::before {
  content: "";
  position: absolute;
  display: block;
  width: 100%;
  top: calc(100% - 1px);
  left: 0;
  height: 1px;
  background-color: black;
  border-radius: 50%;
  z-index: -1;
  transform: rotateX(80deg);
  box-shadow: 0px 0px 60px 38px rgb(0 0 0 / 25%);
}
#flutter_target.mirror {
  -webkit-box-reflect: below 0px linear-gradient(to bottom, rgba(0,0,0,0.0), rgba(0,0,0,0.4));
}

@keyframes spin {
  0% {
    transform: perspective(1000px) rotateY(0deg);
    animation-timing-function: ease-in;
  }
  15% {
    transform: perspective(1000px) rotateY(165deg);
    animation-timing-function: linear;
  }
  75% {
    transform: perspective(1000px) rotateY(195deg);
    animation-timing-function: linear;
  }
  90% {
    transform: perspective(1000px) rotateY(359deg);
    animation-timing-function: ease-out;
  }
  100% {
    transform: perspective(1000px) rotateY(359deg);
    animation-timing-function: linear;
  }
}

/** "Handheld"/Device mode container */
#handheld::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: url(../icons/unsplash-x9WGMWwp1NM.png) no-repeat;
  background-size: 1000px;
  background-position: top right;
  opacity: 1;
  transition: opacity 200ms ease-out;
}

#handheld::after {
  content: "";
  position: absolute;
  display: block;
  width: 77px;
  height: 67px;
  top: 534px;
  right: 573px;
  background: url(../icons/nail.png) no-repeat;
  background-size: 77px;
  opacity: 1;
  transition: opacity 200ms ease-out;
}

#handheld.hidden::before,
#handheld.hidden::after {
  opacity: 0;
}

#flutter_target.handheld {
  position: absolute;
  right: 0px;
  transform-origin: 0px 0px 0px;
  transform: rotate(-14.1deg) scale(0.80) translate(-539px, -45px);
  width: 316px;
  height: 678px;
  border-radius: 34px;
  border: 1px solid #000;
  overflow: hidden;
}

.imageAttribution {
  position: absolute;
  bottom: 6px;
  right: 6px;
  font-size: 10px;
}
.imageAttribution, .imageAttribution a { color: #fff; }