.container1 {
    display: flex;
    width: auto;
    margin: 0 auto;
}

.rocket {
    width: 50%;
    margin: 0 auto;
}

.overall {
    position: relative;
    width: auto;
    margin: 0;
}

.images-container {
    /*border: 2px solid green;*/
    position: relative;
    width: auto;
    margin: 0 auto;
}

.images {
    width: 100%;
    padding: 0;
    height: auto;
    margin: 0 auto;
}

.mycontainer {
    background-color: gray;
    /*border: 1px solid red;*/
    width: 10%;
    position: absolute;
    top: 0;
    left: 45%;
    z-index: -1;
    height: 100%;
}

.i1, .i2, .i3, .i4, .i5, .i6 {
    display: flex;
    margin: auto;
    /*border: 2px dotted gray;*/
}

.desc {
    position: absolute;
    width: 20em;
    display: none;
}

.milestone:hover + span {
    display: inline;
    font-weight: bold;
}

.images img {
    width: 50%;
    height: auto;
    margin: 0 auto;
}

.images .i5 {
    padding-top: 3vh;
}

.images .i6 {
    padding-top: 3vh;
}

.images .i1 {
    padding-top: 3vh;
}

.images .i2 {
    padding-top: 3vh;
}

.images .i3 {
    padding-top: 5vh;
}

.images .i4 {
    padding-top: 5vh;
}

.images .selected {
    width: 70%;
}

img {
    width: 100%;
    height: auto;
    margin: 0 auto;
    /*border: 3px solid blue;*/
}