check > https://www.onphpid.com/membuat-form-login-dengan-bootstrap-dan-php.html

style.css

body{
    background: #F8DA56;
}
.form-login{
    margin-top: 13%;
}
.outter-form-login {
    padding: 20px;
    background: #EEEEEE;
    position: relative;
    border-radius: 5px;
}
.logo-login {
    position: absolute;
    font-size: 35px;
    background: #21A957;
    color: #FFFFFF;
    padding: 10px 18px;
    top: -40px;
    border-radius: 50%;
    left: 40%;
}
.inner-login .form-control {
    background: #D3D3D3;
}
h3.title-login {
    font-size: 20px;
    margin-bottom: 20px;
}

.forget {
    margin-top: 20px;
    color: #ADADAD;
}
.btn-custom-green {
    background: #21A957;
    color: #fff;
}