* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: rgb(0, 10, 44);
  color: white;
  font-family: Arial, Helvetica, sans-serif;
  user-select: none;
}

.container {
  width: 25em;
  height: 25em;
  background-color: rgb(0, 75, 145);
  border-radius: 20px;
  padding: 1em;
  box-shadow: inset 0px 0px 9px 0px rgba(255, 255, 255, 0.568);
}

h1 {
  font-size: 2.3rem;
  font-weight: bold;
  margin-bottom: 1em;
  text-align: center;
}
h1 span {
  color: #009400;
  border-bottom: 4px solid #009400;
}

#display {
  width: 100%;
  height: 3em;
  background-color: white;
  border-radius: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 3em;
}

#display input {
  width: 80%;
  padding: 0.3em 0.5em;
  outline: 0;
  border: 0;
  font-size: 1.2rem;
}

#display i {
  margin: 0 0.5em;
  cursor: pointer;
}

#display .checked{
  font-size: 2rem;
}

button {
  font-size: 1.6rem;
  font-weight: bold;
  padding: 13px 15px;
  text-align: center;
  cursor: pointer;
  border-radius: 10px;
  border: none;
  background: rgb(0, 146, 0);
  color: white;
}

@media screen and (width<=760px) {
  .container {
    width: 90%;
    height: 25em;
    padding-top: 3em;
  }

  h1 {
    font-size: 1.8rem;
    margin-bottom: 1em;
  }

  button {
  font-size: 1.6rem;
  font-weight: bold;
  padding: 13px 5px;
  text-align: center;
  cursor: pointer;
  border-radius: 10px;
  border: none;
  background: rgb(0, 146, 0);
  color: white;
}
}