* {
  margin: 0;
  padding: 0;
  font-family: "poppins", sans-serif;
  box-sizing: border-box;
}
.container {
  width: 100%;
  height: 100vh;
  background: linear-gradient(140deg, #820404, #000000);
  padding: 10px;
}
.calculator {
  width: 100%;
  max-width: 600px;
  margin-left: 10%;
  margin-top: 10%;
}
.calculator h1 span {
  font-size: 60px;
  color: #ffd700;
}
.calculator h1 {
  font-size: 50px;
  color: #faf3e0;
}
.input-box {
  background: rgba(255, 255, 255, 0.1);
  margin: 40px 0;
  padding: 30px;
  border-radius: 15px;
  display: flex;
  align-items: center;
}
.input-box input {
  width: 50%;
  padding: 14px 20px;
  margin-right: 20px;
  font-size: 20px;
  border: 0;
  outline: 0;
  border-radius: 10px;
  position: relative;
  flex: 1;
}
button {
  border: 0;
  outline: 0;
  background-color: #800000;
  padding: 15px 30px;
  border-radius: 10px;
  font-weight: 500;
  color: #000;
  cursor: pointer;
  font-size: 20px;
  transition: 0.5s;
}

button:hover {
  background-color: #a00000;
  transform: scale(1.15);
}

.input-box input::-webkit-calendar-picker-indicator {
  top: 12px;
  right: 0;
  left: 340px;
  bottom: 0;
  width: auto;
  position: absolute;
  background-position: calc(100%-10px);
  background-size: 30px;
  cursor: pointer;
}

#result {
  font-size: 25px;
  color: #faf3e0;
}
#result span {
  font-size: 40px;
  color: #ffd700;
  font-weight: 500;
}