.md-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    min-width: 320px;
    height: auto;
    z-index: 2000;
    visibility: hidden;
    backface-visibility: hidden;
    transform: translateX(-50%) translateY(-50%);
}

.md-show {
    visibility: visible;
}

.md-overlay {
    position: fixed;
    width: 100%;
    height: 100%;
    visibility: hidden;
    top: 0;
    left: 0;
    z-index: 1000;
    opacity: 0;
    background: transparent;
    transition: all 0.3s;
}

.md-show ~ .md-overlay { /* Todos los hermanos de .md-show */
    opacity: 1;
    visibility: visible;
}


/* Effect 4: Newspaper */
.md-effect-4 .md-content {
    -webkit-transform: scale(0) rotate(720deg);
    -moz-transform: scale(0) rotate(720deg);
    -ms-transform: scale(0) rotate(720deg);
    transform: scale(0) rotate(720deg);
    opacity: 0;
}

.md-show.md-effect-4 ~ .md-overlay,
.md-effect-4 .md-content {
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    transition: all 0.5s;
}

.md-show.md-effect-4 .md-content {
    -webkit-transform: scale(1) rotate(0deg);
    -moz-transform: scale(1) rotate(0deg);
    -ms-transform: scale(1) rotate(0deg);
    transform: scale(1) rotate(0deg);
    opacity: 1;
}

/* Effect 6: side fall */
.md-effect-6.md-modal {
    -webkit-perspective: 1300px;
    -moz-perspective: 1300px;
    perspective: 1300px;
}

.md-effect-6 .md-content {
    -webkit-transform-style: preserve-3d;
    -moz-transform-style: preserve-3d;
    transform-style: preserve-3d;
    -webkit-transform: translate(30%) translateZ(-600px) rotate(10deg);
    -moz-transform: translate(30%) translateZ(-600px) rotate(10deg);
    -ms-transform: translate(30%) translateZ(-600px) rotate(10deg);
    transform: translate(30%) translateZ(-600px) rotate(10deg);
    opacity: 0;
}

.md-show.md-effect-6 .md-content {
    -webkit-transition: all 0.3s ease-in;
    -moz-transition: all 0.3s ease-in;
    transition: all 0.3s ease-in;
    -webkit-transform: translate(0%) translateZ(0) rotate(0deg);
    -moz-transform: translate(0%) translateZ(0) rotate(0deg);
    -ms-transform: translate(0%) translateZ(0) rotate(0deg);
    transform: translate(0%) translateZ(0) rotate(0deg);
    opacity: 1;
}