* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  background-color: #d4d4d4;
}

#header {
  background-color: #333;
  color: #f1f1f1;
  text-align: center;
  padding: 30px 0;
  font-size: 64px;
  font-family: cursive;
}

.wraper {
  /*display: flex;*/
  width: 310px;
  margin: 50px auto;
  padding-bottom: 5px;
  border: 10px solid #333;
  box-shadow: 10px 10px #666;
  border-radius: 10px;
  background-color: #fff;
}

#input {
  padding: 15px 10px;
  background-color: #555;
  color: #fff;
  width: 100%;
  height: 100px;
  position: relative;
  user-select: none;
}

#input-now{
  display: block;
  text-align: right;
}

#input-now {
  font-size: 30px;
}

#pressed {
  position: absolute;
  top: 10px;
  left: 10px;
}

.btn-pad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 2px;
}

.btn {
  display: block;
  flex: 1 1 0;
  flex-basis: 50px;
  height: 50px;
  background-color: #222;
  color: #d1d1d1;
  text-align: center;
  padding: 10px;
  margin: 4px;
  border-radius: 5px;
  cursor: pointer;
  user-select: none;
  box-shadow: 2px 6px #000;
  font-size: 26px;
  font-weight: 600;
}

.btn:hover {
  background-color: #555;
  color: #111;
}

.btn-opp {
  background-color: #666;
}

.btn-opt {
  background-color: #111;
}
.btn-eq {
  background-color: #111;
  grid-row: span 2;
}

.btn:active {
  background-color: #444;
  box-shadow: 1px 0 #000;
  transform: translateY(5px);
}

footer {
  background-color: #333;
  text-align: center;
  padding: 50px 0;
  color: #eee;
}