.flex { display: flex; }

.flex-space-between { display: flex; justify-content: space-between; }
.flex-space-around { display: flex; justify-content: space-around; }

.flex-center { display: flex; align-items: center; justify-content: center; }

.flex-center-y { display: flex; align-items: center; }

.flex-column-center { display: flex; flex-direction: column; align-items: center; justify-content: center; }

.flex-wrap { display: flex; flex-wrap: wrap; }

.text-center { text-align: center; }

.mb-a { margin-bottom: auto; }

.m-a { margin: auto; }

.ml-a { margin-left: auto; }

.mr-a { margin-right: auto; }

.mt-a { margin-top: auto; }

.pos-rel { position: relative;}
.pos-abs { position: absolute;}
.pos-fix { position: fixed;}