.banner {
    width: 100%;
    height: 100px;
    text-align: center;
    text-shadow: 3 3 3px gray;
    font-weight: 700;
    line-height: 100px;
    animation: change-bg-color 5s infinite;
}
.main {
    width: 100%;
    display: flex;
    justify-content: space-between;
}
.change, .rl1, .rl2, .rotate {
    width: 20%;
    height: 300px;
    font-weight: 700;
    margin: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2rem;
    color: white;
}
.change {
    border: 5px solid rgb(255, 0, 0);
    animation: change-bg 5s infinite;
}
.rl1 {
    border-radius: 5px 50px 5px 50px;
    border: 5px dashed rgb(255, 0, 0);
    background-color: rgb(0, 195, 255);
}
.rl2 {
    border-radius: 50px 5px 50px 5px;
    border: 5px dashed rgb(255, 0, 0);
    background-color: rgb(0, 195, 255);
}
.rotate {
    border: 5px solid rgb(242, 255, 0);
    background-color: rgb(0, 81, 255);
    animation: rotate 2s infinite;
}
@keyframes change-bg-color {
    0%{
        background-color: red;
        font-size: 1rem;
    }
    10%{
        background-color: rgb(255, 136, 0);
        font-size: 1.2rem;
    }
    20%{
        background-color: rgb(255, 196, 0);
        font-size: 1.4rem;
    }
    30%{
        background-color: rgb(255, 251, 0);
        font-size: 1.6rem;
    }
    40%{
        background-color: rgb(187, 255, 0);
        font-size: 1.8rem;
    }
    50%{
        background-color: rgb(115, 255, 0);
        font-size: 2rem;
    }
    60%{
        background-color: rgb(187, 255, 0);
        font-size: 1.8rem;
    }
    70%{
        background-color: rgb(255, 251, 0);
        font-size: 1.6rem;
    }
    80%{
        background-color: rgb(255, 196, 0);
        font-size: 1.4rem;
    }
    90%{
        background-color: rgb(255, 136, 0);
        font-size: 1.2rem;
    }
    100%{
        background-color: red;
        font-size: 1rem;
    }
}
@keyframes change-bg {
    0%{
        background-image: url(../../images/1.jpg);
    }
    20%{
        background-image: url(../../images/2.jpg);
    }
    40%{
        background-image: url(../../images/3.jpg);
    }
    60%{
        background-image: url(../../images/4.jpg);
    }
    80%{
        background-image: url(../../images/5.jpg);
    }
    100%{
        background-image: url(../../images/6.jpg);
    }
}
@keyframes rotate {
    0%{
        transform: rotate(0deg);
    }
    100%{
        transform: rotate(360deg);
    }
}