index.css

@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@100;300;400;500;900&display=swap');

body {
    font-family: Roboto, sans-serif;
    margin: 0;
    display: block;
    width: 550px;
    margin: 50px auto 0 auto;
    text-align: center;
    background-color: #111827;
    color: white;
    
}

#hero{
    background-color: #10B981;
    border-top-left-radius: 8px; 
    border-top-right-radius: 8px;
    
}
h2{ 
    padding-top: 50px;
    font-size: 30px;
}

input {
    line-height: 1em;
    width: 120px;
    text-align: inherit;
    font-size: 58px;
    font-weight: 900;
    border: 2px solid white;
    color: white;
    background-color: #047857;
    border-radius: 6px;
}
button {
    border: none;
    padding: 10px 15px;
    margin: 25px auto;
    color: #047857;
    font-weight: 500;
    font-family: inherit;
    border-radius: 4px;
    background-color: #ECFDF5;
    opacity: 0.8;
    width: 120px;
}

button:active:active{
    transform: scale(0.95);
    transition: 0.1s;
    
    
}
button:hover{
    opacity: 1;
    transition: 0.1s;
}

.units{
    background-color: #1F2937;
    padding: 10px 0 20px 0;
    border-bottom-left-radius: 8px;
    border-bottom-right-radius: 8px;
}
.converted-el{
    background-color: #273549;
    margin: 20px;
    padding: 20px 10px;
    border-radius: 6px;
}
.converted-el h3 {
    color:#6EE7B7;
    font-size: 22px;
    margin:8px;
}

.converted-el p {
    line-height: 1.5em;
    margin: 5px;
    font-size: 18px;
    font-weight: 500;

}