html,
body {
    height: 100%;
}

body {
    display: flex;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    background-color: #f5f5f5;
}

#login-background {
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

#login-background::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: -1;
    height: 100%;
    width: 100vh;
    margin: auto -25vh -15vh auto;
    background-color: #00b359;
    opacity: .1;
    mask-image: url(../img/golfball.svg);
    -webkit-mask-image: url(../img/golfball.svg);
    animation: rotateBackground linear infinite 120s;
}

@-webkit-keyframes rotateBackground {
    from {-webkit-transform:rotate(0deg);}
    to {  -webkit-transform:rotate(360deg);}
}

@-moz-keyframes rotateBackground {
    from {-moz-transform:rotate(0deg);}
    to {  -moz-transform:rotate(360deg);}
}

.form-signin {
    width: 100%;
    max-width: 330px;
    padding: 15px;
    margin: auto;
    position: relative;
    z-index: 2;
}
.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;
}