example3.css

body{
    margin:0px;
}

div{
    box-sizing: border-box;
}

.ani-box{
    width: 250px;
    height: 100%;
    background-color: black;
    position: fixed;
    color: white;
    z-index: 1;
    padding: 25px;
    transform: translateX(-150px);
    text-align: right;
    transition: all 1s;
}

.ani-box:hover{
    transform: translateX(0px);
    text-align: center;
}

.ani-box:hover p{
    animation-name: boxmove;
    animation-duration: 1s;
}

@keyframes boxmove{
    0%{
        transform: translateX(-150px)
    }
    50%{
        transform: translate(40px) skewX(30deg)
    }
    100%{
        transform: translateX(0px);
    }
}

.sub-layout i{
    padding: 30px;
    background-color: burlywood;
    border-radius: 100%;
    margin-top: 20px;
    box-sizing: border-box;
    color: white;
}

div,input,textarea{
    box-sizing: border-box;
}

.main-background{
    width: 100%;
    height: 500px;
    background-image: url(../img/shoes.jpg);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    padding: 1px;
    text-align: center;
    position: relative;
}

.main-text{
    color: white;
    font-size: 50px;
    margin-top: 150px;
    text-align: center;
}

.main-text span{
    font-size: 25px;
}

.main-button{
    padding:10px;
    font-size: 15px;
    background-color: white;
    border: none;
    border-radius: 5px;
    position: absolute;
    left: 0;
    right: 0;
    margin:auto;
    width: 100px;
}

.sub-box{
    background: #eee;
    max-width: 60%;
    position: relative;
    margin: auto;
    top: -30px;
    height: 200px;
    text-align: center;
    padding: 20px;
}

.ani-text{
    text-align: center;
}

.ani-text:hover{
    animation-name: rt;
    animation-duration: 2s;
}

@keyframes rt{
    0%{
        transform: translateX(0px);
    }
    50%{
        transform: translateX(-100px);
    }
    100%{
        transform: translateX(100px);
    }
}

.form-box{
    background-color: black;
    padding: 30px;
}

.layout-box{
    background: white;
    margin: auto;
    max-width: 70%;
    padding: 30px;
}

.email-form{
    width: 100%;
    padding: 10px;
    font-size: 20px;
    border: 1px solid;
    border-radius: 5px;
}

.name-form{
    width: 50%;
    padding: 10px;
    float: left;
}

.form{
    padding: 10px;
}

.btn{
    padding:10px;
    float: right;
    background-color: orange;
    width: 15%;
    border: none;
    border-radius: 5px;
    color: white;
}

.flex-container{
    background-color: rebeccapurple;
    display: flex;
    height: 100px;
    align-items: center;
}

.flex-item{ 
    padding: 20px;
    color:white;
}

.sub-layout{
    width: 100%;
    background-color: white;
    align-items: center;
    text-align: center;
    display: flex;
}

.sub-item{
    width: 25%;
}

.shoes-box{
    background-color: #eee;
    padding: 20px;
}

.shoes-container{
    display: flex;
    width: 80%;
    margin: auto;
}

.shoes-item{
    width: 33%;
    padding: 10px;
}

.shoes-item img{
    width: 100%;
    display: block;
}

.overlay{
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.3);
    margin-top: 100%;
}

.overlay-wrap{
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.overlay-wrap:hover .overlay{
    margin-top: 50%;
    transition: all 1s;
}

.overlay p{
    color: white;
    font-size: 40px;
    text-align: center;
}


@media screen and (max-width:992px){
    .sub-layout{
        flex-flow: row wrap;
    }
    .sub-item{
        width: 50%;
    }
}

@media screen and (max-width:576px){
    .sub-layout{
        flex-flow: row wrap;
    }
    .sub-item{
        width: 100%;  
    }
}