* {
  margin: 0px;
  padding: 1px;
}

.app{
  /*width: 100vw;*/
  /*height: 100vh;*/
  width: auto;
  height: auto;
  display: flex;
  flex-direction: column;
}

.header {
  width: auto;
  background-color: green;
  box-sizing: border-box;
  border: 8px solid red;
}
.main {
  display: flex;
}
.contents {
  background-color: blue;
  border: 8px solid yellow;
}

.sidebar {
  background-color: white;
  border: 8px solid black;
  height: auto;
}

footer {
  width: auto;
  height: auto;
  background-color: gray;
  border: 8px solid blue;
}

.card{
  /*width: 288px;*/
  width: auto;
  height: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr 1fr;
}
.card__imgframe{
  width: 100%;
  height: auto;
  padding-top: 56.25%;
  background: gray  no-repeat center;
  background-size: cover;
  box-sizing: border-box;
}
.card__textbox{
  width: 100%;
  height: auto;
  padding: 20px 18px;
  background: white;
  box-sizing: border-box;
}
.card__textbox > * + *{
  margin-top: 10px;
}
.card__titletext{
  font-size: 20px;
  font-weight: bold;
  line-height: 125%;
}
.card__overviewtext{
  font-size: 12px;
  line-height: 150%;
}
.card-skin{
box-shadow: 2px 2px 6px rgba(0,0,0,.4);
}