.g-container {
    margin: 20px auto;
    width: 400px;
}

.g-item {
    width: 190px;
    height: 190px;
    box-sizing: border-box;
    border: 1px solid #666;
    border-radius: 10px;
    line-height: 190px;
    font-size: 32px;
    text-align: center;
    cursor:pointer;
    margin: 5px;
    transition: .1s all;
}

.g-float {
    overflow: hidden;
    
    .g-item {
        float: left;
    }
    
    .g-item:first-child {
        height: 390px;
    }

    .g-item:first-child:hover {
        height: 190px;
        width: 390px;
    }
}

h2 {
    font-size: 28px;
    text-align: center;
    margin: 30px auto
}


.g-flex {
    width: 400px;
    height: 400px;
    overflow: hidden;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    flex-direction: column;
    
    .g-item:first-child {
        height: 390px;
    }
}

.g-flex:hover {
    flex-direction: row;

    .g-item:first-child {
        height: 190px;
        width: 390px;
    }
}

.g-grid {
    width: 400px;
    height: 400px;
    overflow: hidden;
    display: grid;
    grid-template-columns: repeat(2, 50%);
    grid-template-rows: repeat(2, 50%);
    
    .g-item {
        width: unset;
        height: unset;
    }
    
    .g-item:first-child {
        grid-row: 1 / 3;
        grid-column: 1 / 2;
    }
}

.g-grid:hover {
    .g-item:first-child {
        grid-row: 1 / 2;
        grid-column: 1 / 3;
    }
}