*,
*::before,
*::after{
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
  padding: 0;
  margin: 0;
}

:root{
  --color-bg: #f7f7f7;
  --color-bg-invrt: #111111;
/*  --color-bg-alt-2: #999999;*/
  --color-primary: #ffffff;
  --color-primary-invrt: #dfdfdf;
  --color-secondary: #000000;
/*  --color-secondary: darkorange;*/
  --gapEquation: calc(1/5*100% - (1 - 1/5)*10px);
  --radialBlackBg: radial-gradient(circle farthest-corner at left center, #2c2f3f 0%, #030507 100%);

}

html{
  font-size: 62.5%;
}
body{
  font-size: 1.6rem;
  letter-spacing: 0.2px;
/*  background: #f0f0f0;*/
  color: var(--color-primary);
  font-family: sans-serif;
  background: var(--color-bg);
  background: url("storming.jpg");
}
a{
  text-decoration: none;
  color: inherit;
}
ul{
  list-style: none;
}
h1{
  font-size: 2.2rem;
}
h2{
  font-size: 2rem;
}
/*h3{
  font-weight: normal;
}*/
/*span{
  opacity: 60%;
  font-weight: bolder;
  font-size: 1.5rem;
}*/
/*input{
  border: 0;
  background: inherit;
  color: inherit;
}
input:focus {
  outline: 0;
}*/
main > section{
  margin: 220px auto 0 auto;
  max-width: 420px;
/*  padding: 20px;*/
/*  height: 500px;*/
  border: 2px solid rgba(70, 80, 100, 0.1);
  border-radius: 10px;
  display: flex;
  background: rgba(70, 80, 100, 0.3);
  backdrop-filter: blur(10px);
  justify-content: center;
}
.calcrItems{
  display: flex;
  flex-flow: row wrap;
  justify-content: center;
  align-items: center;
  gap: 10px;
  padding: 25px;
  width: 100%;
}

.calcrItems li, .calcrItems div{
  flex: var(--gapEquation);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 3rem;
  cursor: pointer;
  padding: 20px 0;
/*  width: 50px;*/
/*  height: 50px;*/
  border: 2px solid rgba(230, 230, 230, 0.9);
  border-radius: 5px;
/*  flex: 1 1 auto;*/
}
.calcrItems li:hover{
  background: rgba(235, 235, 235, 1);
  color: #121212;
  box-shadow: 0px 0px 8px 8px rgba(255, 255, 255, 0.5);
}
.calcrItems div{
  flex: 3 0 100%;
  cursor: default;
  margin: 30px 0;
  justify-content: flex-end;
  padding: 20px;
}