@import url('https://fonts.googleapis.com/css?family=Quicksand:wght@300;400;500&display=swap');
*
{
  margin: 0;
  padding:0;
  box-sizing: border-box;
  font-family: 'Quicksand', sans-serif;
}
body
{
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #091921;
}
body::before
{
  content: ' ';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;  
  background: linear-gradient(#e91e63,#ffc107);
  clip-path: circle(22% at 30% 20%);
}
body::after
{
  content: ' ';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;  
  background: linear-gradient(#ffffff,#da00ff);
  clip-path: circle(20% at 70% 90%);
}
.container
{
  position: relative;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  overflow: hidden;
  z-index: 10;
  backdrop-filter: blur(15px);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  border-left: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 5px 5px 30px rgba(0,0,0,0.2);
}
.container .calculator
{
  position: relative;
  display: grid;
  
}
.container .calculator .value
{
  grid-column: span 4;
  height: 140px;
  width: 300px;
  text-align: right;
  border: none;
  outline: none;
  padding: 10px;
  font-size: 30px;
  background: transparent;
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  border-right: 1px solid rgba(255, 255, 255, 0.05);
}
.container .calculator span
{
  display: grid;
  place-items: center;
  width: 75px;
  height: 75px;
  color: #fff;
  font-weight: 400;
  cursor: pointer;
  font-size: 20px;
  user-select: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  border-right: 1px solid rgba(255, 255, 255, 0.05);  
  transition: 0.5s;
}
.container .calculator span:hover
{
  transition: 0s;
  background: rgba(255, 255, 255, 0.05);
}
.container .calculator span:active
{
  background: #14ff47;
  color: #192f00;
  font-size: 24px;
  font-weight: 500;
}
.container .calculator .clear
{
  grid-column: span 2;
  width: 150px;
  background: rgba(255,255,255,0.05);
}
.container .calculator .plus
{
  grid-row: span 2;
  height: 150px;
}
.equal
{
  background: rgba(255,255,255,0.05);  
}
time: 8:30