styles.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    margin: 0;
    padding: 0;
    height: 100vh;
    font-family: "montserrat", sans-serif;
    background-color: #f3f4f7;
    display: flex;
    align-items: center;
    justify-content: center;
}

input, textarea, button{
    font-family: inherit;
}

.container{
    width: 420px;
    height: 530px;
    padding: 25px;
    background-color: #f3f4f7;
    border-radius: 10px;
    box-shadow: 0 0 25px 5px rgba(83, 87, 95, 0.25);
}

h1{
    padding: 20px 0;
    color: #090909;
    text-align: center;
    text-transform: uppercase;
    font-size: 30px;
    font-weight: 700;
}

.text-field{
    width: 100%;
    height: 230px;
    margin: 20px 0;
    padding: 10px;
    outline: none;
    resize: none;
    background: transparent;
    border: 1px solid #52565e;
    font-size: 16px;
    font-weight: 400;
}

.copy-btn, .paste-btn{
    padding: 10px 15px;
    color: #f3f4f7;
    background-color: #037ef3;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 600;
    text-transform: uppercase;
    border: none;
    outline: none;
    cursor: pointer;
}

.copy-btn i, .paste-btn i{
    padding-left: 10px;
}
.copy-btn:active, .paste-btn:active{
    transform: scale(0.95);
}

span.done{
    display: block;
    margin-top: 50px;
    text-align: center;
    font-size: 26px;
    color: #858585;
    transform: scale(0);
    transition: all 0.5s;
}

span.bounce-effect{
    animation: bounceIn 0.8s linear;
}

/* bounceIn Animation */
@keyframes bounceIn {
    0%{
        opacity: 0;
        transform: scale(0.3);
    }
    20%{
        transform: scale(1.1);
    }
    40%{
        transform: scale(0.9);
    }
    60%{
        opacity: 1;
        transform: scale(1.03);
    }
    80%{
        transform: scale(0.97);
    }
    100%{
        opacity: 1;
        transform: scale(1);
    }
}