html,
body {
  height: 100%;
  padding: 0;
  margin: 0;
}

.header {
  height: 100%;
  text-align: center;
}

img {
  max-height: 300px;
  width: 100%;
  object-fit: contain;
  display: block;
  margin: 0 auto;
}

.img2 {
  height: 20%;
  width: 90%;
  margin-top: 1%;
  object-fit: contain;
}

.main {
  width: 100%;
  float: center;
  background: green;
  height: -moz-calc(100% - 30%);
  height: -webkit-calc(100% - 30%);
  height: calc(100% - 30%);
  display: block
}

.btn {
  margin: 1.5em auto;
  padding: 1em;
  border: 0;
  border-radius: 30px;
  cursor: pointer;
  font-family: 'Open Sans', sans-serif;
  font-size: 18px;
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60%;
  box-sizing: border-box;
}

.city-label {
  font-family: 'Open Sans', sans-serif;
  font-size: 20px;
  font-weight: 800;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  color: #000;
  text-transform: uppercase;
}

.btn3 {
  margin: 0.5em;
  padding: 1em 2em;

  text-align: center;
  white-space: nowrap;
  cursor: pointer;
  font-family: 'Open Sans', sans-serif;
  font-size: 16px;
  font-weight: bold;
  text-align: center;
  float: center;
  width: 50%;
  height: auto;
  border: 2px solid #ec343f;
  background-color: transparent;
  background-repeat: no-repeat;
  overflow: hidden;

}