.maxwidth {
    position: absolute;
    background: rgb(210, 235, 210);
    border: 2px solid rgb(100, 100, 100);
    left: 0%;    top: 0px;
    width: 100%; height: 95.9%;
}

/* =============== HOME ====================== */
.side-left {                                    /* mobile */
    display: none;
}

.telefono {                                      /*mobile */
    display: block;
    background: rgb(210, 235, 210);
    border: 0px solid yellow;
    position: absolute;
    left:  0.0%;   top:0.0%;
    width: 100.0%;   height: 99.9%;
    overflow-x: auto;

}

.computer {                                  /* mobile */
    display: none;
}

.computer-mini {                                 /* computer */
    display: none;

}

.side-right {                                /* mobile */
    display: none;
}


<!--   =================  End MEDIA Mobile ======================  -->

<!--   =================== MEDIA COMPUTER ======================  -->

body {
    background: red; /* Цвет фона веб-страницы */\
    height: 95%;
}

@media (min-width: 450px) {

.side-left {                                   /* computer */
    display: block;
    background: darkgreen;
    border: 0px solid red;
    position: absolute;
    left: 0.0%;      top:0.0%;
    width: 15.95%;   height: 99.9%;
    padding-left:0%; padding-top: 0%;
    color: black; font-size: 1.1vw;
}

.telefono {                                      /* computer */
    display: block;
    background: rgb(210, 235, 210);
    border: 0px solid yellow;
    position: absolute;
    left:  16.0%;   top:0.0%;
    width: 32.0%;   height: 99.9%;
    padding-left:0%; padding-top: 0%;
    color: black; font-size: 1.1vw;
}

.computer {                                 /* computer */
    display: block;
    background: rgb(210, 235, 210);
    /*background: none;*/
    border: 0px solid brown;
    position: absolute;
    left: 48.0%;     top:0.0%;
    width: 32.5%;   height: 99.9%;
    padding-left:0%; padding-top: 0%;
    color: black; font-size: 1.1vw;
}


.side-right {                               /* computer */
    display: block;
    background:  darkgreen;
    border: 0px solid black;
    position: absolute;
    left: 80.0%;     top:0.0%;
    width: 19.9%;   height: 99.9%;
    padding-left: 0;
    color: white;

}

 <!--   =================== END BLOCKS of MEDIA COMPUTER ======================  -->

.minimax {                                 /* computer */
    display: block;
    background: ;
    border: 0px dotted red;
    position: absolute;
    left: -90.0%;     top:1.0%;
    width: 198.0%;   height: 10%;
    padding: 0px;
    color: darkgreen;

}