@font-face {
font-family: "Kharkiv Tone";
src: url("font/Kharkiv-Tone-04.10.2020.otf");
}
body {
  margin: 0;
  padding: 0;
  color: black;
  background: linear-gradient( #DEEEFF, transparent 1px), linear-gradient( 90deg, #DEEEFF, transparent 1px);
  background-size: 40px 40px;
  background-position: center center;
  font-family: "Kharkiv Tone";
  overflow-x: hidden;
}
a {
  text-decoration: underline;
  text-decoration-style: wavy;
}
a:visited {
  color: pink;
}
.titul {
  display: flex;
  width: 100%;
  height: 100px;
  background: #fff;
  align-items: center;
  margin-top: 0;
  margin-bottom: 0;
  padding-left: 300px;
  font-size: 30px;
  color: #4C13EE;
}
.container {
  display: flex;
  flex-direction: column;
  width: 49%;
  height: min-content;
  min-width: 300px;
  min-height: 300px;
  left: 0;
  right: 0;
  margin: auto;
  border: 3px solid #4C13EE;
  border-top: 40px solid #4C13EE;
}
#expression {
  background: #4C13EE;
  width: 90%;
  height: 20%;
  min-height: 80px;
  border: 0;
  outline: 0;
  font-size: 20px;
  display: block;
  left: 0;
  right: 0;
  margin: auto;
  margin-top: 5%;
  margin-bottom: 0;
  text-indent: 10px;
  font-family: "Kharkiv Tone";
  color: #fff;
}
::placeholder {
  color: #fff;
  opacity: 0.75;
  font-family: "Kharkiv Tone";
}
:focus {
    outline: 0;
    border: 0;
}
.copy {
  display: flex;
  width: min-content;
  background: #fff;
  align-items: center;
  border: none;
  padding: 3px;
  margin: 10px;
  margin-left: calc(10px + 5%);
  font-size: 15px;
  font-family: "Kharkiv Tone";
  color: #4C13EE;
  cursor: pointer;
}
.buttons {
  display: inline-flex;
  margin-left: 36px;
  margin-right: 36px;
  justify-content: space-between;
  margin-bottom: 5%;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  font-family: "Kharkiv Tone";
  font-size: 25px;
  width: max-content;
  width: 80px;
  height: max-content;
  height: 80px;
  flex: 1 1 80px;
  cursor: pointer;
}
.white {
  background: 0;
  border-top: 3px solid #4C13EE;
  color: #4C13EE;
}
.blue {
  background: #4C13EE;
  color: #fff;
}
.greeting {
  width: max-content;
  flex: 1 1 240px;
}
.calculate {
  width: max-content;
  flex: 1 1 240px;
}
.nine {
  flex: 0 0 80px;
}
.zero {
  flex: 0 0 80px;
}
#wrapper {
  width: 100%;
  height: 100%;
  display: none;
}
#wrapper.active {
  display: block;
}
#overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    background-color: gray;
    opacity: 0.5;
}
#modal-window {
  padding: 5px;
  position: absolute;
  display: flex;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  width: 30%;
  height: max-content;
  background: #fff;
  color: #4C13EE;
  justify-content: flex-end;
  font-family: "Kharkiv Tone";
  z-index: 2;
}
#close {
  color: #4C13EE;
  font-family: "Kharkiv Tone";
  font-size: 20px;
  position: absolute;
  border: none;
  background: none;
  cursor: pointer;
}
.content {
left: 0;
right: 0;
margin: auto;
text-align: center;
padding: 20px;
}
h2 {
  margin-bottom: 20px;
}
p {
  margin-bottom: 15px;
  line-height: 1.5;
}
@media (max-width: 990px) {
  .greeting {
    font-size: 15px;
  }
  .calculate {
    font-size: 15px;
  }
  .nine {
    flex: 1 1 80px;
  }
  .zero {
    flex: 1 1 80px;
  }
  #expression {
    font-size: 11px;
  }