Estilos para un modal manual

modal.css

.modal-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;

    display: flex;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
}

.modal-container {
    width: 250px;
    height: 250px;
    background-color: white;
    border-radius: 5px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.5);
}

.center {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 250px;
    height: 250px;
    color: red;
}


.fade-in {
  animation: fadeIn ease-out 0.2s;
  -webkit-animation: fadeIn ease-out 0.2s;
  -moz-animation: fadeIn ease-out 0.2s;
  -o-animation: fadeIn ease-out 0.2s;
  -ms-animation: fadeIn ease-out 0.2s;
}

@keyframes fadeIn {
  0% {opacity:0;}
  100% {opacity:1;}
}

@-moz-keyframes fadeIn {
  0% {opacity:0;}
  100% {opacity:1;}
}

@-webkit-keyframes fadeIn {
  0% {opacity:0;}
  100% {opacity:1;}
}

@-o-keyframes fadeIn {
  0% {opacity:0;}
  100% {opacity:1;}
}

@-ms-keyframes fadeIn {
  0% {opacity:0;}
  100% {opacity:1;}
}

Excelente recurso

Muchas gracias maestro!!

Thanks

Muchas gracias