I had to use 89.5px instead of 89px to get rid of the scroll bar. Why?

/* ================================= 
  Base Element Styles
==================================== */

* {
    box-sizing: border-box;
}

body {
    line-height: 1.6;
    color: #3a3a3a;
}

p:last-child {
    margin-bottom: 0;
}

a {
    color: #fff;
    text-decoration: none;
}

/* ================================= 
  Base Layout Styles
==================================== */

/* ---- Navigation ---- */

.name {
    margin: 0;
}

/* ---- Layout Containers ---- */

.container {
    padding-left: 1em;
    padding-right: 1em;
}

.main-header {
    padding: 1.5em 0;
    background: #3acec2;
}

.main-footer {
    text-align: center;
    padding: 2em 0;
    background: #d9e4ea;
}

/* ================================= 
  Media Queries
==================================== */

@media (min-width: 769px) {

    .wrap {
        min-height: calc(100vh - 89.5px);
    }

    .container {
        width: 70%;
        max-width: 1000px;
        margin: 0 auto;
    }
}