style.css

/* css reset */
body {
    margin: 0px;
    padding: 0px;
    background: url("books.jpg");
    background-size: cover;
    color: white;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

.left {
    display: inline-block;
    position: absolute;
    top: 20px;
    left: 34px;
    font-size: 20px;
    text-align: center;
}

.left div {
    text-align: center;
}

.left img {
    width: 60px;
    filter: invert();
    border-radius: 10px;
}

.mid {
    display: block;
    /* border: 2px solid green; */
    margin: 20px auto;
    width: 80%;
}

.right {
    position: absolute;
    /* border: 2px solid yellow; */
    top: 32px;
    right: 34px;
    display: inline-block;
}

.navbar {
    display: inline-block;
}

.navbar li {
    display: inline-block;
    font-size: 20px;
}

.navbar li a {
    color: white;
    text-decoration: none;
    padding: 34px 23px;
}

.navbar li a:hover,
.navbar li a.active {
    text-decoration: underline;
    color: gray;
}

.btn {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    margin: 0px 5px;
    color: white;
    background-color: rgba(58, 57, 57, 0.632);
    padding: 7px 16px;
    border: 2px solid rgb(107, 105, 105);
    border-radius: 20px;
    font-size: 14px;
    cursor: pointer;
    box-shadow: 0px 5px 10px rgb(0, 0, 0);
    transition: all 0.2s;
}

.btn:hover {
    box-shadow :0px 10px 20px -5px rgba(0, 0, 0 ,40%);
    transform: scale(1.03);
}
.btn:active {
    box-shadow: 0px 4px 8px rgb(0, 0, 0 ,30%) ;
    transform: scale(0.95);
}

.container {
    /* border: 2px solid white; */
    margin: 78px 35px;
    padding: 35px;
    width: 43%;
    border-radius: 20px;
}

.form-group input {
    text-align: center;
    display: block;
    width: 372px;
    padding: 8px;
    /* border: 2px solid black; */
    margin: 3px auto;
    border-radius: 10px;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 15px;

}

.container h1 {
    text-align: center;
}

.container button {
    display: block;
    width: 35%;
    margin: auto;
    padding: 10px;
}