*{
  margin:0;
  padding:0;
  box-sizing: border-box;
  font-family: 'Times New Roman', Times, serif;
}

#bg-video {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
}

body{
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(45deg,#0a0a0a,#3a4452);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: -1;
}

.calculate{
  border: 3px solid #717377;
  padding: 25px;
  border-radius: 20px;
  box-shadow: 0px 3px 15px rgba(113,115,119, 0.5);
  background: rgba(14, 13, 13, 0.1 transparent);
  backdrop-filter: blur(10px);
  /* color: white; */

}

input{
  width:320px;
  border: 3px solid rgb(220, 220, 220);
  padding: 24px;
  margin:10px;
  background: transparent;
  box-shadow: 0px 3px 15px rgba(84,84,84,0.1);
  font-size: 40px;
  text-align: right;
  cursor: pointer;
  color:aliceblue;
}

button{
   border:1px solid white;
   text-decoration: solid;
   width:60px;
   height: 60px;
   margin: 10px;
   border-radius: 50%;
   background: transparent;
   color: aliceblue;
   font-size: 22px;
   box-shadow: -8px -8px 15px rgba(255,255,255, 0.1);
   cursor:pointer;
}

.equals{
  background-color: orangered;
}

.operators{
  color:aquamarine;
}