body{
    height: 100vh;
    font-family: cambria, Cochin, Georgia, Times, 'Times New Roman', serif;
    background: conic-gradient(at 125% 50%, #b78cf7, #ff7c94, #ffcf0d, #ff7c94, #b78cf7);
}

.container{
    width: 95%;
    height: 100vh;
    margin: auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

.calculator{
    border: 1px solid lightgrey;
    background-color: whitesmoke;
    border-radius: 5px;
    width: 400px;
    margin: auto;
    padding: 0 25px;
    font-size: 1rem;
    font-weight: 100;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 1.9);
}   

.calculator input{
    box-sizing: border-box;
    width: 90%;
    padding: 8px;
    outline: none;
    border-radius: 5px;
    border: 1px solid lightgrey;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.calculator button{
    width: 10px;
    padding: 8px;
    outline: none;
    cursor: pointer;
    border: 1px solid lightgrey;
    border-radius: 5px;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
    background-color: whitesmoke;
}

.calculator button:hover{
    background-color: rgba(0, 0, 0, 0.1);
}

#quality{
    width: 100%;
    padding: 8px;
    outline: none;
    border-radius: 5px;
    border: 1px solid lightgrey;
}

#tip-amount {
    visibility: hidden;
    min-width: 250px;
    margin: auto;
    background-color: limegreen;
    color: white;
    bottom: 30px;
    text-align: center;
    border-radius: 2px;
    padding: 16px;
    position: fixed;
}

#tip-amount.show{
    visibility: visible;
    -webkit-animation: fadein 0.5s, fadeout 0.5s 2.5s;
    animation: fadein 0.5s, fadeout 0.5s 2.5s;
}

@-webkit-keyframes fadein{
    from{bottom:0; opacity: 0;}
    to {bottom: 30px; opacity: 1;}
}

@keyframes fadein{
    from{bottom:0; opacity: 0;}
    to{bottom:0; opacity: 0;}
}

@-webkit-keyframes fadeout{
    from {bottom: 30px; opacity: 1;}
    to{bottom:0; opacity: 0;}
}

@keyframes fadeout{
    from {bottom: 30px; opacity: 1;}
    to{bottom:0; opacity: 0;}
}

@media(max-width: 480px){
    .calculator input{
        width: 85%;
    }

    .calculator button{
        width: 15%;
    }
}

@media(max-width: 320px){
    .calculator input{
        width: 80%;
    }
}