html,
body {
    height: 100%;
}

body {
    -ms-flex-align: center;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    background: url(../img/technological-design-background.jpg) center center no-repeat ;
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
    text-align:center;
    display: flex;
    align-items: center;
    position: relative
}

.form-signin:before {
    content: '';
    height: 100%;
    left: 0;
    position: absolute;
    top: 0;
    width: 100%;
    background-color: rgba(0,0,0,0.3);
    z-index: -1;
    border-radius: 10px;
}

.form-signin {
    width: 100%;
    max-width: 330px;
    padding: 15px;
    margin: auto;
}

.form-signin .checkbox {
    font-weight: 400;
}

.form-signin .form-control {
    position: relative;
    box-sizing: border-box;
    height: auto;
    padding: 10px;
    font-size: 16px;
}

.form-signin .form-control:focus {
    z-index: 2;
}

.form-signin input[type="email"] {
    margin-bottom: -1px;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 0;
}

.form-signin input[type="password"] {
    margin-bottom: 10px;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}