*{
    margin: 0;
    padding: 0;
    font-family: 'poppins', sans-serif;
    box-sizing: border-box;
}
body{
    background: #efefef;
    text-align: center;
}
nav{
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #1876f2;
    padding: 5px 5%;
    position: sticky;
    top: 0;
    z-index: 100;
}
.logo{
    width: 160px;
    margin-right: 45px;
}
.nav-left, .nav-right{
    display: flex;
    align-items: center;
}
.nav-left ul li{
    list-style: none;
    display: inline-block;
}
.nav-left ul li img{
    width: 40px;
    margin: 0 25px;
}
.search-box{
    background: #ffffff;
    width: 350px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    padding: 0 15px;
}

.search-box img{
    width: 18px;
}

.search-box input{
    width: 100%;
    background: transparent;
    padding: 10px;
    outline: none;
    border: 0;
}
.left-sidebar{
    flex-basis:25%;
    position: sticky;
    top: 70px;
    align-self: flex-start;

}
.test{
    width: 80%;
    max-width: 700px;
    margin: 80px auto;
    text-align: center;
}

.sentence-container{
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    margin-bottom: 30px;
}
.sentence-container img{
    width: 80%;
    max-width: 700px;
    height: auto;
}
.buttons button{
    display: block;
    margin: auto;
    cursor: pointer;
    padding: 12px 25px;
    border: 1px solid #9a9a9a;
    color: #626262;
    background: #fff;
    border-radius: 6px;
    font-size: 16px;
}

.buttons button:hover{
    background: #1876f2;
    color: #fff;
}
.back{
    display: block;
    margin-top: 20px;
    margin-left: 20px;
    cursor: pointer;
    padding: 5px 10px;
    border: 1px solid #9a9a9a;
    color: #626262;
    background: transparent;
    border-radius: 4px;
}