Flex-box css study

Flex-box css study

/*
Flex-box css study, 
references:
https://css-tricks.com/snippets/css/a-guide-to-flexbox/
https://www.w3schools.com/css/css3_flexbox.asp
https://www.youtube.com/watch?v=k32voqQhODc
*/

.call-outs-container {
    max-width: 1400px;
    margin: 40px auto 0 auto;
    /* align-items: center;
    align-items: flex-end;
    align-items: stretch; */
}

.call-out {
    padding: 20px;
    margin-bottom: 20px;
    /* flex: 1;
    widht: 30% */
    flex-basis: 30%;
}

.call-out:nth-child(1) { background-color: #c0dbe2; }
.call-out:nth-child(2) { background-color: #c0dbe3; }
.call-out:nth-child(3) { background-color: #c0dbe4; }

/* Mobile version */
@media (min-width: 900px) {
    .call-outs-container {
        display: flex;
        justify-content: space-between;
    }
}

/* have galery with fixed size */
.fixed-size-container {
    max-width: 1400px;
    margin: 40px auto 0 auto;
    background-color: #FFF;
    padding: 30px 0;
    display: flex;
    align-items: center;
    justify-content: space-around;
    flex-wrap: wrap;
}

.fixed-size {
    width: 150px;
    height: 100px;
    background-color: #990b47;
    color: #FFF;
    line-height: 100px;
    text-align: center;
}

/* Have item with vertical center align */

.banner {
    height: 400px;
    max-width: 700px;
    margin: 40px auto 40px auto;
    background-color: #2a2a2a;
    display: flex;
}

.center-me {
    color: #FFF;
    font-size: 50px;
    margin: auto;
}