style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
  border: none;
  outline: none;
}

body {
  background-color: #9873fe;
}

.wrapper {
  width: 90%;
  max-width: 25em;
  background-color: #fff;
  border-radius: 0.8em;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 1em;
}

.app-details {
  display: flex;
  align-items: center;
  flex-direction: column;
}

.app-icon {
  width: 9.37em;
}

.app-title {
  font-size: 1.5em;
  /* text-transform: uppercase; */
  margin-bottom: 1em;
}

label {
  display: block;
  font-weight: 600;
}

input#amount {
  display: block;
  width: 100%;
  font-size: 1.2em;
  font-weight: 400;
  border-bottom: 2px solid #02002c;
  color: #7a789d;
  padding: 0.4em;
  margin-bottom: 2rem;
}

input#amount:focus {
  color: #9873fe;
  border-color: #9873fe;
}

.dropdowns {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1em;
}

select {
  width: 100%;
  padding: 0.6em;
  font-size: 1em;
  border-radius: 0.3em;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  color: #fff;
  background-color: #9873fe;
  background-image: url(img/arrow-down.svg);
  background-repeat: no-repeat;
  background-size: 20px 20px;
  background-position: right 15px top 50%, center;
}

select option{
    background-color: #fff;
    color: #02002c;
    
}

button{
    width: 100%;
    font-size: 1em;
    font-weight: 500;
    color: #fff;
    background-color: #9873fe;
    padding: 1em 0;
    margin-top: 1em;
    border-radius: 0.3em;
}

#result{
    font-size: 1.2em;
    margin-top: 1em;
    padding: 0.8em 0;
    text-align: center;
    color: #02002c;
    background-color: #e5dbff;
}