style.css

*{
    box-sizing: border-box;
}

@font-face {
    font-family: "Poppins";
    src: local('Poppins'),
     url("./assets/fonts/Poppins-Bold.ttf") format('truetype'),
     url("./assets/fonts/Poppins-BoldItalic.ttf") format('truetype'),
     url("./assets/fonts/Poppins-ExtraBold.ttf") format('truetype'),
     url("./assets/fonts/Poppins-ExtraBoldItalic.ttf") format('truetype'),
     url("./assets/fonts/Poppins-Italic.ttf") format('truetype'),
     url("./assets/fonts/Poppins-Regular.ttf") format('truetype')
}

body {
   background: hsl(0, 0%, 94%);
   font-family: 'Poppins', san-serif;
   margin: 0px;
   padding: 0px;
}

.container {
    max-width: 375px;
    margin: 50px auto;
    background: white;
    border-radius: 20px 20px 80px 20px;
    padding: 20px;
    position: relative;
}

.inputs {
    display: flex;
    justify-content: space-between;  
}

label {
   margin: 10px;
   font-size: 12px;
   color: hsl(0, 1%, 44%);
}

input {
    width: 90px;
    margin: 10px;
    padding: 5px;
    font-weight: bold;
    cursor: pointer;
    border-radius: 5px;
    border: 1px solid hsl(0, 0%, 86%);
}

input:hover {
    border: 1px solid hsl(259, 100%, 65%);
}

.invalid {
    border: 1px solid hsl(0, 100%, 67%);
}

.error {
    color: hsl(0, 100%, 67%);
    font-style: italic;
    font-size: 8px;
    margin-left: 5px;
}

.submit {
    margin: 50px 0;
}

button {
    position: absolute;
    left: 160px;
    top: 130px; 
    border-radius: 50%;
    border: 1px;
    padding: 5px;
    background: hsl(259, 100%, 65%);
    width: 60px;
    height: 60px;
    cursor: pointer;
}

button:hover {
    background: #000000;
}

.output {
    font-size: 44px;
    padding: 10px 5px;
    font-weight: bold;
    font-style: italic;
}

.output span {
    color: hsl(259, 100%, 65%);
}

.attribution { 
    font-size: 12px;
    text-align: center; 
}

.attribution a { 
    color: hsl(228, 45%, 44%); 
}


@media only screen and (min-width: 1220px) {
    .container {
        max-width: 500px;
        height: 600px;
    }

    .inputs {
        width: 375px;
    }

    input {
        padding: 10px;
        font-weight: bold;
    }

    button {
        left: 380px;
        top: 132px; 
    }
}