@keyframes bgpnk {
    0%   {background-image: url(../img/1.jpg);}
    50%  {background-image: url(../img/2.jpg)}
    75% {background-image: url(../img/3.jpg);}
    100%   {background-image: url(../img/1.jpg);}
}

body{
    animation-name: bgpnk;
    animation-duration: 60s;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    animation-iteration-count: infinite;
}

#loggrb {
    background-color: transparent;
    width: 100%;
    height: 30vh;
    margin-bottom: 1%;
    background-image: url(../img/grbwb.png);
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
}