style.css

* {
    margin: 0;
    padding: 0;
    color: #fff;
    font-size: 15px;
    font-variant: small-caps;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}
body {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #06021b;
}

.main{
    height: 550px;
    width: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    border-radius: 20px;
    text-align: center;
    background-color: #000;
}

img{
    width: 100px;
    height: 100px;
    margin: 20px;
    border: 5px solid #ff0;
    border-radius: 50%;
    transition: width 1s, transform 0.8s, height 1s;
}
img:hover{
    height: 120px;
    width: 120px;
    transform: rotate(360deg);
}

input[type="text"], input[type="email"], input[type="password"]{
    width: 350px;
    margin: 15px;
    padding: 20px;
    border-radius: 35px;
    background-color: #000;
    border: 2px solid green;
    transition: width 1s;
}
input[type="text"]:focus, input[type="email"]:focus, input[type="password"]:focus{
    width: 400px;
}

input[type="submit"]{
    width: 250px;
    height: 40px;
    margin: 20px;
    margin-bottom: 50px;
    padding: 10px;
    cursor: pointer;
    border-radius: 30px;
    background-color: #000;
    border: 2px solid rgb(177, 37, 147);
    transition: transform 1.5s;
}
input[type="submit"]:hover{
    transform: scale(1.1);
}