Basic CSS animation easings, inspired by the legendary Robert Penner (http://robertpenner.com/easing/).

easings.scss

/*///////////////////////////////////////////////////////////////
    EASINGS

    SCSS variables to set custom easings for CSS animations.

    Usage:
        `transition: transform 500ms $easeInOutCubic;`

///////////////////////////////////////////////////////////////*/

/* Cubic */
$easeInCubic    : cubic-bezier(0.550, 0.055, 0.675, 0.190);
$easeOutCubic   : cubic-bezier(0.215, 0.610, 0.355, 1.000);
$easeInOutCubic : cubic-bezier(0.645, 0.045, 0.355, 1.000);

/* Circ */
$easeInCirc     : cubic-bezier(0.600, 0.040, 0.980, 0.335);
$easeOutCirc    : cubic-bezier(0.075, 0.820, 0.165, 1.000);
$easeInOutCirc  : cubic-bezier(0.785, 0.135, 0.150, 0.860);

/* Expo */
$easeInExpo     : cubic-bezier(0.950, 0.050, 0.795, 0.035);
$easeOutExpo    : cubic-bezier(0.190, 1.000, 0.220, 1.000);
$easeInOutExpo  : cubic-bezier(1.000, 0.000, 0.000, 1.000);

/* Quad */
$easeInQuad     : cubic-bezier(0.550, 0.085, 0.680, 0.530);
$easeOutQuad    : cubic-bezier(0.250, 0.460, 0.450, 0.940);
$easeInOutQuad  : cubic-bezier(0.455, 0.030, 0.515, 0.955);

/* Quart */
$easeInQuart    : cubic-bezier(0.895, 0.030, 0.685, 0.220);
$easeOutQuart   : cubic-bezier(0.165, 0.840, 0.440, 1.000);
$easeInOutQuart : cubic-bezier(0.770, 0.000, 0.175, 1.000);

/* Quint */
$easeInQuint    : cubic-bezier(0.755, 0.050, 0.855, 0.060);
$easeOutQuint   : cubic-bezier(0.230, 1.000, 0.320, 1.000);
$easeInOutQuint : cubic-bezier(0.860, 0.000, 0.070, 1.000);

/* Sine */
$easeInSine     : cubic-bezier(0.470, 0.000, 0.745, 0.715);
$easeOutSine    : cubic-bezier(0.390, 0.575, 0.565, 1.000);
$easeInOutSine  : cubic-bezier(0.445, 0.050, 0.550, 0.950);

/* Back */
$easeInBack     : cubic-bezier(0.600, -0.280, 0.735, 0.045);
$easeOutBack    : cubic-bezier(0.175,  0.885, 0.320, 1.275);
$easeInOutBack  : cubic-bezier(0.680, -0.550, 0.265, 1.550);