style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Poppins", sans-serif;
}
body {
    background-color: #3d4b5c;
}
.container {
    width: 450px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    border-radius: 10px;
    padding: 30px;
}
.container p {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 8px;
    color: #252647;
}
.container input {
    width: 100%;
    height: 50px;
    border: 1px solid #252647;
    outline: none;
    border-radius: 10px;
    margin: 10px 0 20px;
    padding: 10px;
}
.container #img {
    width: 200px;
    border-radius: 5px;
    display: none;
}
.container #img img {
    width: 100%;
    padding: 10px;
}
.container #img.show {
    margin: 10px auto;
    border: 1px solid #6b5959;
    display: block;
}
.container button {
    width: 100%;
    height: 50px;
    background-color: #2e5ba0;
    color: #fff;
    border: none;
    outline: none;
    border-radius: 10px;
    cursor: pointer;
    margin: 10px 0;
    font-size: 16px;
    font-weight: 500;
    transition: 0.5s;
}
.container button:hover {
    background-color:#2e5ca0c0;
}
.error {
    animation: error 0.1s linear 6;
}
@keyframes error {
    0% {
        transform: translate(0);
    }
    50% {
        transform: translate(-2px);
    }
    100% {
        transform: translate(0);
    }
}