style.css

*{
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

body{
    background-color: #2980b9;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin : 0;
}

h1{
    color: white;
    font-size: 40px;
}

h2{
    margin-bottom: 0;
    text-align: center;
}

.card{
    background-color: white;
    padding: 24px;
    min-width: 300px;
    border-radius: 24px;
}
.card input{
    width: 100%;
    padding: 8px;
    margin-top: 4px;
    border-radius: 4px;
    border: solid 1px #ecf0f1;
}

.card .input-group{
    margin-top: 8px;
}

.card button{
    background-color:#27ae60 ;
    border: none;
    color: white;
    padding: 8px;
    width: 100%;
    font-size: 16px;
    margin-top: 8px;
}

.result-values{
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    max-width: 60vw;
}

.result-values  .result-value{
    background-color:#e67e22 ;
    color: white;
    margin: 8px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    text-align: center;
    line-height: 48px;
    font-size: 24px;
}