.line {
    position: absolute; 
    border-radius: 1em; 
    animation-duration: 1s; 
    transition: transform 1s linear;
}

.line-wide {
    transform: scaleX(1);
    animation-name: change-width;
}

.line-high {
    transform: scaleY(1);
    animation-name: change-height;
}

@keyframes change-width {
    0% {
        transform: scaleX(0); 
    }

    100% {
        transform: scaleX(1);  
    }
} 

@keyframes change-height {
    0% {
        transform: scaleY(0); 
    }

    100% {
        transform: scaleY(1);  
    }
}