@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap');

*
{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}

body
{
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #091921;
}
.calculator
{
  position: relative;
  display: grid;
}
.calculator .value
{
  grid-column: span 4;
  height: 100px;
  text-align: right;
  border: none;
  outline: none;
  padding: 10px;
  font-size: 18px;
}
.calculator span
{
  display: grid;
  width: 60px;
  height: 60px;
  color: #fff;
  background: #0c2835;
  place-items: center;
  border: 1px solid rgba(0,0,0,.1);
}
.calculator span:active
{
  background: #74ff3b;
  color: #111;
}
.calculator span.clear
{
  grid-column: span 2;
  width: 120px;
  background: #ff3077;
}
.calculator span.plus
{
  grid-row: span 2;
  height: 120px;
}
.calculator span.equal
{
  background: #03b1ff;
}

.footer {
   position: absolute;
   width: 100%;
   height:66px;
   bottom: 0;
   left: 0;
   background-color:#18B4BF; /*#34a1eb */
   text-align: center;
}