.square {
    width: 100px;
    height: 100px;
}

.square {
    width: 100px;
    height: 100px;
}

#blockRed {
        background-color: rgba(255, 0, 0, 0.892);
}

#blockBlueviolet {
        background-color: blueviolet;
}


.square {
            width: 100px;
            height: 100px;
            display: block;
}


#container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    width: 300px;  
    height: 300px;
    margin: auto; 
}

.square {
    width: 100%;
    height: 100%;
    position: relative; 
}

#blockRed1, #blockRed2 {
    background-color: red;
}

#blockBlue1, #blockBlue2 {
    background-color: blue;
}


#blockRed1 { grid-column: 1; grid-row: 1; }
#blockBlue1 { grid-column: 2; grid-row: 1; }
#blockBlue2 { grid-column: 1; grid-row: 2; }
#blockRed2 { grid-column: 2; grid-row: 2; }

.cutout1 {
    position: absolute;
    width: 70px;  
    height: 12px;
    background-color: red;
    left: 50%; 
    transform: translateX(-50%); 
}


.cutout2 {
    position: absolute;
    width: 70px;  
    height: 12px;
    background-color: red;
    left: 50%; 
    bottom: 0%;
    transform: translateX(-50%); 
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh; 
    margin: 0;
}