main.css

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

    body {
        background: black url(images/bg.jpg);
        background-position: center;
        color: white;
        font-family: monospace;
    }
    .login {
        position: absolute;
        top: 200px;
        left: 50%;
        transform: translateX(-50%);
        background:transparent;
        width: 700px;
        height: 300px;
        border: 2px solid aqua;
        border-radius: 5px;
        box-shadow: inset 0 0 15px 2px aqua, 0 0 15px 2px aqua;
        transition: 0.2s linear;
    }
    @media only screen and (max-width: 768px){
        .login{
            left: 0px;
            transform: translateX(0%);
        }
    }
    .login:hover {
        width: 705px;
        height: 305px;
    }

    .separator {
        position: absolute;
        width: 2px;
        left: 400px;
        height: 100%;
        border: none;
        transform: rotate(180deg);
        box-shadow: inset 0 0 15px 2px aqua, 0 0 15px 2px aqua;
    }

    .left {
        float: left;
        padding: 15px;
        width: 400px;
    }

    form {
        width: 370px;
        text-align: center;
    }
    form span{
        color: rgb(189, 187, 187);
        margin-left: 190px;
        cursor: pointer;
    }

    .input{
        margin-top: 15px;
        color: rgb(161, 161, 161);
        font-size: 15px;
        font-style: italic;
        padding: 10px 10px 10px 30px;
        width: 95%;
        height: 40px;
        border: 1px solid black;
    }
    .username {
        margin-top: 35px;
        background: rgba(20,20,20,.7) url(images/boy-icon.png) no-repeat 5px 10px;
        background-size: 20px 18px;
    }
    .password {
        background: rgba(20,20,20,.7) url(images/psw-icon.png) no-repeat 5px 10px;
        background-size: 20px 20px;
    }
    .formCheckBox{
        margin: 30px auto auto -300px;
        box-shadow: 0 0 6px 1px aqua;
        cursor: pointer;
    }
    .rememberMe{
        position: absolute;
        margin: 28px auto auto 5px;
    }
    .submitBtn{
        position: absolute;
        width: 120px;
        height: 35px;
        margin: -30px auto auto 55px;
        background-color: red;
        border: 1px solid white;
        border-radius: 3px;
        color: white;
        font-size: 16px; 
        font-weight: bold;
        box-shadow: 0 0 13px 3px red;
        cursor: pointer;
        transition: .1s linear;
    }
    .submitBtn:hover{
        box-shadow: 0 0 13px 3px aqua;
        width: 122px;
        height: 37px;
    }

    .lock-icon {
        position: relative;
        width: 30px;
        height: 25px;
        filter: drop-shadow(0 0 5px rgb(244, 245, 245));
    }

    .login-title {
        position: absolute;
        margin-top: 2px;
        margin-left: 5px;
        font-size: 20px;
    }

    .right {
        float: right;
        width: 295px;
        padding: 15px;
        margin-top: 65px;
        text-align: center;
    }
    .signInWith{
        text-align: left;
        margin-bottom: 10px;
        padding-left: 65px;
        width: 95%;
        height: 40px;
        background-color: transparent;
        border: 1px solid white;
        border-radius: 4px;
        color: white;
        box-shadow: 0 0 10px 2px aqua;
        cursor: pointer;
        transition: .2s linear;
    }
    .twitterIcon{
        background:url(images/twitter-icon.png) no-repeat 10px 10px;
        background-size: 20px 20px;
    }
    .facebookIcon{
        background:url(images/facebook-icon.png) no-repeat 10px 10px;
        background-size: 20px 20px;
    }
    .gitIcon{
        background:url(images/github-icon.png) no-repeat 10px 9px;
        background-size: 20px 20px;
    }
    .linkedinIcon{
        background: url(images/linkedin-icon.png) no-repeat 10px 10px;
        background-size: 20px 18px;
    }

    .twitterIcon:hover{
        box-shadow: inset 0 0 15px 2px red, 0 0 10px 2px red;
        width: 98%;
        font-size: 14px;
    }
    .facebookIcon:hover{
        box-shadow: inset 0 0 15px 2px red, 0 0 10px 2px red;
        width: 98%;
        font-size: 14px;
    }
    .gitIcon:hover{
        box-shadow: inset 0 0 15px 2px red, 0 0 10px 2px red;
        width: 98%;
        font-size: 14px;
    }
    .linkedinIcon:hover{
        box-shadow: inset 0 0 15px 2px red, 0 0 10px 2px red;
        width: 98%;
        font-size: 14px;
    }