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

.left    { text-align: left; }
.right   { text-align: right; }
.center  { text-align: center; }
.justify { text-align: justify; }
.start   { text-align: start; }
.end     { text-align: end; }