style.css

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;500;600;700;800;900&display=swap');

*{
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
    font-family: 'Montserrat',sans-serif;
}

body{
    background-color:#1e1e1e;
    color: white;
    height: 100vh;
}

.main{
    padding-block: 4rem;
    text-align: center;
}
.contianer{
    padding-top: 12rem;
    max-width: 100%;
    margin-bottom: 12px;
    
}

h1{
    color:#30DAC6 ;
    text-align: center;
    font-weight: 800;
    font-size:500%;
}

.f-input{
    text-align: center;
      margin-block: 2rem;
}

.f-input input,button {
   margin-block: 1rem;
    margin-inline: 0.5rem;
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    font-weight: 600;
}


.output {
    margin-inline: auto;
    width: 90%;
    display: flex;
    padding: 2rem;
    background:#252526 ;
    border-radius: 3rem;
    align-items: center;
    justify-content: space-around;
}

.card {
    background: #1e1e1e;
    height: 150px;
    width: 35rem;
    border-radius: 1rem;
    font-size: 3rem;
    font-weight: 700;
    display: flex;
    flex-direction: column;
    justify-content: center;
    color: white;
    overflow: hidden;
}

.value {
    text-align: center;
    font-size:4rem;
}
.label {
    text-align: center;
    padding-top: 1rem;
    font-size:1.2rem ;
}
.footer {
 font-size: 15px;
 justify-content: center;
  text-align: center;
  bottom:0; 
  padding-top: 12vh;
}

@media screen and (max-width: 800px) {
    .output {
        width: 50%;
        flex-direction: column;
        align-items: center;
        justify-content: space-between;
        gap: 2rem;
    }

    .main {
        padding-block: 2rem;
    }
    
}