*,
*:before,
*:after {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
html{
    height: 100%;
}
body{
    width: 100%;
    height: 100%;
}
.my-main{
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #2B2B2B;
}
.flex-container{
    height: 100%;
    display: flex;
    flex-direction: column;
}
.link:hover{
    opacity: 0.8;
}